Updated runtime files.
diff --git a/runtime/doc/insert.txt b/runtime/doc/insert.txt
index 030f0de..d8fa408 100644
--- a/runtime/doc/insert.txt
+++ b/runtime/doc/insert.txt
@@ -1,4 +1,4 @@
-*insert.txt* For Vim version 7.3. Last change: 2012 Apr 05
+*insert.txt* For Vim version 7.3. Last change: 2012 Apr 20
VIM REFERENCE MANUAL by Bram Moolenaar
@@ -383,8 +383,11 @@
beware of the cursor possibly being beyond the end of the line.
The CTRL-O command takes you to Normal mode. If you then use a command enter
-Insert mode again it doesn't nest. Thus when typing "a<C-O>a" and then <Esc>
-takes you back to Normal mode, you do not need to type <Esc> twice.
+Insert mode again it normally doesn't nest. Thus when typing "a<C-O>a" and
+then <Esc> takes you back to Normal mode, you do not need to type <Esc> twice.
+An exception is when not typing the command, e.g. when executing a mapping or
+sourcing a script. This makes mappings work that briefly switch to Insert
+mode.
The shifted cursor keys are not available on all terminals.