diff --git a/vim-commands b/vim-commands
index cdcea87..d43b7a2 100644
--- a/vim-commands
+++ b/vim-commands
@@ -158,5 +158,34 @@ Line mode:
 		Copy = yank
 		paste = put
 
-	> for yanking(copying) use 'y' or 'Y' command.
+	> for yanking(copying) use 'y' command.
+   > Just like 'd' command behavior with 'p' command is same.
+	
+	* Undo command:
 
+		>	To undo the action of previous command, use 'u' command to
+			undo the action.
+		>	To redo the same command undone by undo 'u' command use 'CTRL+r'
+			command.
+
+	* Type of registers:
+
+		> Named registers : "a to "z
+		> Number register : "0 to "9
+		> unnamed register : ""
+
+		> unnamed register contains the data with acquired from one of the
+		  commmands d, x, c, y and s. 
+		  c ->  , s -> substitute.
+
+		> "0  : Most recently yanked data
+		> "1	: The data which is deleted recently.
+		> "2	: The data which was deleted second last time.
+		> "3	: and so on till "9....
+
+		> use :reg to see the content of each register.
+		> use :reg <arg>
+			wherer arg -> register name to show the content
+								arg can be string containing all the
+								registers named concatenated into a 
+								single string.