diff --git a/runtime/doc/quickfix.txt b/runtime/doc/quickfix.txt
index 5879727..ae45819 100644
--- a/runtime/doc/quickfix.txt
+++ b/runtime/doc/quickfix.txt
@@ -229,8 +229,17 @@
 			current window is used instead of the quickfix list.
 
 							*:cq* *:cquit*
-:cq[uit][!]		Quit Vim with an error code, so that the compiler
-			will not compile the same file again.
+:cq[uit][!]
+:{N}cq[uit][!]
+:cq[uit][!] {N}		Quit Vim with error code {N}.  {N} defaults to one.
+			Useful when Vim is called from another program:
+			e.g., a compiler will not compile the same file again,
+			`git commit` will abort the committing process, `fc`
+			(built-in for shells like bash and zsh) will not
+			execute the command, etc.  will not compile the same
+			file again.
+			{N} can also be zero, in which case Vim exits
+			normally.
 			WARNING: All changes in files are lost!  Also when the
 			[!] is not used.  It works like ":qall!" |:qall|,
 			except that Vim returns a non-zero exit code.