Document backslash disabling hooks

Fixes #1223

README.asciidoc

@@ -398,6 +398,16 @@ command itself.
 for example, `3W` selects 3 consecutive words and `3w` select the third word on
 the right of selection end.
 
+Disabling Hooks
+~~~~~~~~~~~~~~~
+
+Any normal mode command can be prefixed with `\` which will disable hook execution
+for the duration for the command (including the duration of modes the command could
+move to, so `\i` will disable hooks for the whole insert session).
+
+As autoindentation is implemented in terms of hooks, this can be used to disable
+it when pasting text.
+
 Changes
 ~~~~~~~
 

doc/manpages/keys.asciidoc

@@ -67,6 +67,25 @@ Insert mode
 *<a-;>*::
 	escape to normal mode for a single command
 
+Using Counts
+------------
+
+In normal mode, commands can be prefixed with a numeric count, which can control
+the command behaviour.
+
+for example, *3W* selects 3 consecutive words and *3w* select the third word on
+the right of selection end.
+
+Disabling Hooks
+---------------
+
+Any normal mode command can be prefixed with *\* which will disable hook execution
+for the duration for the command (including the duration of modes the command could
+move to, so *\i* will disable hooks for the whole insert session).
+
+As autoindentation is implemented in terms of hooks, this can be used to disable
+it when pasting text.
+
 Movement
 --------
 'word' is a sequence of alphanumeric characters or underscore, and 'WORD'