adds information about "Is Paid" and "Update Stock"

erpnext/docs/user/manual/en/accounts/purchase-invoice.md

@@ -3,9 +3,9 @@ that your Supplier sends you for products or services delivered. Here you
 accrue expenses to your Supplier. Making a Purchase Invoice is very similar to
 making a Purchase Order.
 
-To make a new Purchase Invoice, go to:
-
-> Accounts > Documents > Purchase Invoice > New Purchase Invoice
+To make a new Purchase Invoice:
+> type "new purchase invoice" into the search bar then select "New Purchase 
+Invoice from the drop down"
 
 or click on “Make Purchase Invoice” in Purchase Order or Purchase Receipt.
 
@@ -15,6 +15,14 @@ The concept of “Posting Date” is again same as Sales Invoice. “Bill No”
 “Bill Date” helps to track the bill number as set by your Supplier for
 reference.
 
+#### Is Paid option
+The **Is Paid** checkbox should be checked if there is a part or full payment 
+on the invoice at posting date.
+
+#### Update Stock
+The **Update Stock** checkbox should be checked if you want ERPNext to automatically
+ update your inventory. Consequently, there will be no need for a Delivery Note.
+
 #### Accounting Impact
 
 Like in Sales Invoice, you have to enter an Expense or an Asset account for
@@ -34,7 +42,18 @@ Debits:
 Credits:
 
   * Supplier
+  
+##### Accounting Treatment When **Is Paid** is checked
+If **Is Paid** is checked, ERPNext will also make the following
+accounting entries:
 
+Debits:
+
+  * Supplier
+  
+Credits:
+  * Bank/Cash Account
+  
 To see entries in your Purchase Invoice after you “Submit”, click on “View
 Ledger”.