clean: require double -f options to nuke nested git repository and work tree

diff --git a/Documentation/githooks.txt b/Documentation/githooks.txt
index 1fd512bca2e12f5eb0abac0edb0dfb2a86949cec..1c736738ccc91b6929226a27e02716221ec3ef05 100644 (file)
--- a/Documentation/githooks.txt
+++ b/Documentation/githooks.txt
@@ -151,6 +151,10 @@ indicating whether the checkout was a branch checkout (changing branches,
 flag=1) or a file checkout (retrieving a file from the index, flag=0).
 This hook cannot affect the outcome of 'git-checkout'.
 
+It is also run after 'git-clone', unless the --no-checkout (-n) option is
+used. The first parameter given to the hook is the null-ref, the second the
+ref of the new HEAD and the flag is always 1.
+
 This hook can be used to perform repository validity checks, auto-display
 differences from the previous HEAD if different, or set working dir metadata
 properties.