diff --git a/docs/user/docs.user.md b/docs/user/docs.user.md
index b98bf6d..7b4575f 100644
--- a/docs/user/docs.user.md
+++ b/docs/user/docs.user.md
@@ -15,7 +15,8 @@
 		"docs.user.projects",
 		"docs.user.website",
 		"docs.user.tools",
-		"docs.user.customize"
+		"docs.user.customize",
+		"docs.user.knowledge"
 	],
 	"_no_toc": 1
 }
@@ -120,10 +121,11 @@
 	1. [Maintenance Schedule](docs.user.support.maintenance_schedule.html)
 	1. [Maintenance Visit](docs.user.support.maintenance_visit.html)
 	1. [Maintenance Schedule](docs.user.support.maintenance_schedule.html)
+	1. [Newsletter](docs.user.support.newsletter.html)
 1. [Projects](docs.user.projects.html)
 	1. [Projects](docs.user.projects.projects.html)
 	1. [Task](docs.user.projects.task.html)
-	1. [Time Log](docs.user.projects.time_log.html)
+	1. [Time Log](docs.user.projects.timelog.html)
 1. [Website](docs.user.website.html)
 	1. [Setup](docs.user.website.setup.html)
 	1. [Web Pages](docs.user.website.web_page.html)
@@ -143,4 +145,7 @@
 	1. [Customize Form](docs.user.customize.custom_form.html)
 	1. [Hide / Unhide modules](docs.user.customize.hide_unhide.html)
 	1. [Print Formats](docs.user.customize.print_formats.html)
-	1. [Custom Scripts](docs.user.customize.custom_scripts.html)
\ No newline at end of file
+	1. [Custom Scripts](docs.user.customize.custom_scripts.html)
+1. [Knowledge Library](docs.user.knowledge.html)
+	1. [Fiscal Year](docs.user.knowledge.fiscal_year.html)
+	1. [Accounting Knowledge](docs.user.knowledge.accounting.html)
\ No newline at end of file
diff --git a/docs/user/hr/docs.user.hr.payroll.md b/docs/user/hr/docs.user.hr.payroll.md
index 598be00..9da590d 100644
--- a/docs/user/hr/docs.user.hr.payroll.md
+++ b/docs/user/hr/docs.user.hr.payroll.md
@@ -17,7 +17,7 @@
 
 
 ![Salary Structure](img/salary-structure.png)
-s
+
 
 ### In the Salary Structure,
 
diff --git a/docs/user/knowledge/docs.user.knowledge.accounting.md b/docs/user/knowledge/docs.user.knowledge.accounting.md
new file mode 100644
index 0000000..e100923
--- /dev/null
+++ b/docs/user/knowledge/docs.user.knowledge.accounting.md
@@ -0,0 +1,109 @@
+---
+{
+	"_label": "Accounting Knowledge"
+}
+---
+
+Chart of Accounts represents a tree like representation of all accounting heads, used to represent company's financial information. There are two types of accounts: Balance Sheet and Profit and Loss Statement accounts. Balance Sheet consists of Assets and Liabilities accounts and Profit and Loss Statement accounts consists of Incomes and Expenses.
+
+**Assets:** Bank and Cash balances, outstanding amounts of customers and all other assets are recorded here.
+
+**Liabilities:** All the company's liabilities like shareholder's capital, outstanding amount to be paid to suppliers, taxes to be paid to concerned to authorities are recorded under this group.
+
+**Income:** Income from direct/indirect sales.
+
+**Expenses:** All the expenses to run the business, like salaries, purchases, rent etc. are recorded here.
+
+### Debit and Credit
+
+Each of these accounts are either "Debit" or "Credit" type. Assets, Expenses are "Debit" accounts and Liabilities, Incomes are "Credit" accounts.
+
+Accounting Entries
+
+The balance of account can be increased / decreased, depending on account type and transaction type.
+
+<table class="table table-bordered">
+    <thead>
+        <tr class="active">
+            <td style="text-align: center;">Account Type</td>
+            <td style="text-align: center;">Transaction Type</td>
+            <td style="text-align: center;">Effect on account balance</td>
+        </tr>
+    </thead>
+    <tbody>
+        <tr>
+            <td style="text-align: center;">Debit</td>
+            <td style="text-align: center;">Debit</td>
+            <td style="text-align: center;">Increases</td>
+        </tr>
+        <tr>
+            <td style="text-align: center;">Debit</td>
+            <td style="text-align: center;">Credit</td>
+            <td style="text-align: center;">Decreases</td>
+        </tr>
+        <tr>
+            <td style="text-align: center;">Credit</td>
+            <td style="text-align: center;">Credit</td>
+            <td style="text-align: center;">Increases</td>
+        </tr>
+        <tr>
+            <td style="text-align: center;">Credit</td>
+            <td style="text-align: center;">Debit</td>
+            <td style="text-align: center;">Decreases</td>
+        </tr>
+    </tbody>
+</table>
+
+### Double Entry
+
+This means that every accounting entry has two parts, one debit and one credit and must affect two separate accounts. If you add or deduct to one account, some other account somewhere else must also be affected. See the example below:
+
+1. Company sells a laptop worth 50000 to Customer A and delivers that with an invoice.
+
+As the company will receive a payment from customer, the customer is considered as an asset account. For booking income, company maintains an account called "Sales of Laptop". So, entries will be done in the following manner: 
+
+<table class="table table-bordered">
+    <thead>
+        <tr class="active">
+            <td style="text-align: center;">Account</td>
+            <td style="text-align: center;">Debit</td>
+            <td style="text-align: center;">Credit</td>
+        </tr>
+    </thead>
+    <tbody>
+        <tr>
+            <td style="text-align: center;">Customer A</td>
+            <td style="text-align: center;">50000</td>
+            <td style="text-align: center;"></td>
+        </tr>
+        <tr>
+            <td style="text-align: center;">Sales of Laptop</td>
+            <td style="text-align: center;"></td>
+            <td style="text-align: center;">50000</td>
+        </tr>
+    </tbody>
+</table>
+
+Customer A has made the payment, so customer balance should decreased based on the paid amount, which will increase "Cash" balance.
+
+<table class="table table-bordered">
+    <thead>
+        <tr class="active">
+            <td style="text-align: center;">Account</td>
+            <td style="text-align: center;">Debit</td>
+            <td style="text-align: center;">Credit</td>
+        </tr>
+    </thead>
+    <tbody>
+        <tr>
+            <td style="text-align: center;">Customer A</td>
+            <td style="text-align: center;"></td>
+            <td style="text-align: center;">50000</td>
+        </tr>
+        <tr>
+            <td style="text-align: center;">Cash</td>
+            <td style="text-align: center;">50000</td>
+            <td style="text-align: center;"></td>
+        </tr>
+    </tbody>
+</table>
\ No newline at end of file
diff --git a/docs/user/knowledge/docs.user.knowledge.fiscal_year.md b/docs/user/knowledge/docs.user.knowledge.fiscal_year.md
new file mode 100644
index 0000000..980872c
--- /dev/null
+++ b/docs/user/knowledge/docs.user.knowledge.fiscal_year.md
@@ -0,0 +1,10 @@
+---
+{
+	"_label": "Fiscal-Year"
+}
+---
+
+A fiscal year is also known as a financial year or a budget year. It is used for calculating financial statements in businesses and other organisations. The fiscal year may or may not be the same as a calendar year. For tax purposes, companies can choose to be calendar-year taxpayers or fiscal-year taxpayers.  In many jurisdictions, regulatory laws regarding accounting and taxation require such reports once per twelve months. However, it is not mandatory that the period should be  a calendar year (that is, 1 January to 31 December).
+
+A fiscal year usually starts at the beginning of a quarter, such as April 1, July 1 or October 1. However, most companies' fiscal year also coincides with the calendar year, which starts January 1. For the most part, it is simpler and easier that way. For some organizations, there are advantages in starting the fiscal year at a different time. For example, businesses that are seasonal might start their fiscal year on July 1 or October 1. A business that has most of its income in the fall and most of its expenses in the spring might also choose to start its fiscal year on October 1. That way, they know what their income will be for that year, and can adjust their expenses to maintain their desired profit margins.
+
diff --git a/docs/user/knowledge/docs.user.knowledge.md b/docs/user/knowledge/docs.user.knowledge.md
new file mode 100644
index 0000000..b3cb772
--- /dev/null
+++ b/docs/user/knowledge/docs.user.knowledge.md
@@ -0,0 +1,9 @@
+---
+{
+	"_label": "Knowledge Library",
+	"_toc": [
+		"docs.user.knowledge.fiscal_year"		
+	]
+}
+---
+Knowledge Library contains definitions and explanations of various management concepts. This page is created for users who wish to elaborate their conceptual knowledge.
\ No newline at end of file
diff --git a/docs/user/mfg/docs.user.mfg.bom.md b/docs/user/mfg/docs.user.mfg.bom.md
index 7dd3e3c..9436f86 100644
--- a/docs/user/mfg/docs.user.mfg.bom.md
+++ b/docs/user/mfg/docs.user.mfg.bom.md
@@ -10,7 +10,7 @@
 > Manufacturing > Bill of Materials > New BOM
 
 
-![Bill of Materials](img/mfg-bom.png)
+![Bill of Materials](img/bom.png)
 
 
 
diff --git a/docs/user/setup/docs.user.setup.cost_centers.md b/docs/user/setup/docs.user.setup.cost_centers.md
index 322c177..3df26e1 100644
--- a/docs/user/setup/docs.user.setup.cost_centers.md
+++ b/docs/user/setup/docs.user.setup.cost_centers.md
@@ -23,6 +23,9 @@
 
 Thus when you do your analysis you get a better understanding as to which side of your business is doing better. Since ERPNext has an option to add multiple Companies, you can create Cost Centers for each Company and manage it separately.
 
+To understand chart of cost centers in detail visit [Accounting Knowledge](docs.user.knowledge.accounting.html)
+
+
 ### Chart of Cost Centers
 
 To setup your Chart of Cost Centers go to:
diff --git a/docs/user/setup/docs.user.setup.first.md b/docs/user/setup/docs.user.setup.first.md
index 5e1c5d8..4784a69 100644
--- a/docs/user/setup/docs.user.setup.first.md
+++ b/docs/user/setup/docs.user.setup.first.md
@@ -11,7 +11,7 @@
 
 Some definitions:
 
-- Fiscal Year: This is your financial year, the fiscal year usually starts on 1st Jan or 1st March for most regions. If you are not sure, consult an accountant.
+- [Fiscal Year](docs.user.knowledge.fiscal_year.html): This is your financial year, the fiscal year usually starts on 1st Jan or 1st March for most regions. If you are not sure, consult an accountant.
 - Abbreviation: In a multi-company setup, the abbreviation is appended to each account, so keep it small (2-4) characters and all caps.
 
 This will also set the default **Currency** and time zone for your account. Once you complete this, your first **Company** and **Chart of Accounts** will be created.
diff --git a/docs/user/setup/docs.user.setup.taxes.md b/docs/user/setup/docs.user.setup.taxes.md
index 52c82bc..91ed591 100644
--- a/docs/user/setup/docs.user.setup.taxes.md
+++ b/docs/user/setup/docs.user.setup.taxes.md
@@ -7,7 +7,14 @@
 
 ### Tax Accounts
 
-For Tax Accounts that you want to use in the tax templates, you must mention them as type “Tax” in your Chart of Accounts.
+For Tax Accounts that you want to use in the tax templates, you must mention them as type “Tax” in your Chart of Accounts. Some Item-tax features are given below :
+
+- **Discount**: The maximum Discount that can be applied on an Item can be fixed in the Item master. Read [Discount](docs.user.selling.discount.html)
+- **Inclusive and Exclusive Tax**: ERPNext allows you to enter Item rates which are tax inclusive.
+- **Flat Discount**: This feature will be added soon.
+- **Exception to the rule**: Item tax settings are required only if a particular Item has a different tax rate than the rate defined in the standard tax Account
+
+
 
 ## Sales Taxes and Charges Master
 
diff --git a/docs/user/stock/docs.user.stock.item.md b/docs/user/stock/docs.user.stock.item.md
index c5c58bd..6aa3587 100644
--- a/docs/user/stock/docs.user.stock.item.md
+++ b/docs/user/stock/docs.user.stock.item.md
@@ -29,7 +29,7 @@
 
 ### Item Pricing
 
-Item Price and Price Lists: ERPNext lets you maintain multiple selling prices for an Item using Price Lists. A Price List is a place where different rate plans can be stored. It’s a name you can give to a set of Item prices. In case you have different zones (based on the shipping costs), for different currencies etc, you can maintain different Price Lists. A Price List is formed when you create different Item Prices. To import Item Price visit “Import Item Price”.
+Item Price and Price Lists: ERPNext lets you maintain multiple selling prices for an Item using Price Lists. A Price List is a place where different rate plans can be stored. It’s a name you can give to a set of Item prices. In case you have different zones (based on the shipping costs), for different currencies etc, you can maintain different Price Lists. A Price List is formed when you create different Item Prices. To import Item Price see [Importing Data](docs.user.data_import.md).
 
 ## Inventory : Warehouse and Stock Setting
 
@@ -56,10 +56,29 @@
 
 ### Item Tax
 
-These settings are required only if a particular Item has a different tax rate than the rate defined in the standard tax Account. For example,  If you have a tax Account, “VAT 10%” and this particular Item is exempted from tax, then you select “VAT 10%” in the first column, and set “0” as the tax rate in the second column.
+These settings are required only if a particular Item has a different tax rate than the rate defined in the standard tax Account. For example,  If you have a tax Account, “VAT 10%” and this particular Item is exempted from tax, then you select “VAT 10%” in the first column, and set “0” as the tax rate in the second column. 
+
+Go to [Setting Up Taxes](docs.user.setup.taxes.html) to understand this topic in detail.
 
 ### Inspection
 
 Inspection Required: If an incoming inspection (at the time of delivery from the Supplier) is mandatory for this Item, mention “Inspection Required” as “Yes”. The system will ensure that a Quality Inspection will be prepared and approved before a Purchase 	Receipt is submitted.
 
 Inspection Criteria: If a Quality Inspection is prepared for this Item, then this template of criteria will automatically be updated in the Quality Inspection table of the Quality Inspection. Examples of Criteria are: Weight, Length, Finish etc.
+
+### Purchase Details
+
+**Lead time days:** Lead time days are the number of days required for the Item to reach the warehouse.
+
+
+**Default Expense Account:** It is the account in which cost of the Item will be debited.
+
+**Default Cost Centre:** It is used for tracking expense for this Item.
+
+### Sales Details
+
+**Default Income Account:**  Income account selected here will be fetched automatically in sales invoice for this item.
+
+**Cost Centre:** Cost center selected here will be fetched automatically in sales invoice for this item.
+
+Visit [Manufacturing](docs.user.mfg.html) and [Website](docs.user.website.html) to understand these topics in detail.
diff --git a/docs/user/support/docs.user.support.md b/docs/user/support/docs.user.support.md
index bd7bfa1..acd693f 100644
--- a/docs/user/support/docs.user.support.md
+++ b/docs/user/support/docs.user.support.md
@@ -5,7 +5,8 @@
 		"docs.user.support.support_ticket",
 		"docs.user.support.customer_issue",
 		"docs.user.support.maintenance_visit",
-		"docs.user.support.maintenance_schedule"
+		"docs.user.support.maintenance_schedule",
+		"docs.user.support.newsletter"
 	]
 }
 ---
diff --git a/docs/user/support/docs.user.support.newsletter.md b/docs/user/support/docs.user.support.newsletter.md
new file mode 100644
index 0000000..443a6e5
--- /dev/null
+++ b/docs/user/support/docs.user.support.newsletter.md
@@ -0,0 +1,14 @@
+---
+{
+	"_label": "Newsletter"
+}
+---
+
+A newsletter is a short written report that tells about the recent activities of an organization. It is generally sent to members of the organization, potential clients customers or potential leads.
+
+In ERPNext, you can use this UI to send any type of communication to a large number of audience. The process of sending bulk email to a target audience is very simple and easy. 
+
+Select  the list that you want to send the email to. Fill in your content in the message box, and send your newsletter.If you wish to test your email, to see how it looks to the recepient, you can use the test function.Save the document before testing. A test email will be sent to your email id. You can send the email to all the intended receipients by clicking on the send button.
+
+
+![Newsletter](img/newsletter.png)