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diff --git a/Documentation/kernel-doc-nano-HOWTO.txt b/Documentation/kernel-doc-nano-HOWTO.txt
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+++ b/Documentation/kernel-doc-nano-HOWTO.txt
@@ -345,5 +345,10 @@ documentation, in <filename>, for the functions listed.
section titled <section title> from <filename>.
Spaces are allowed in <section title>; do not quote the <section title>.
+!C<filename> is replaced by nothing, but makes the tools check that
+all DOC: sections and documented functions, symbols, etc. are used.
+This makes sense to use when you use !F/!P only and want to verify
+that all documentation is included.
+
Tim.
*/ <twaugh@redhat.com>