Document --strict flag to the fsck-cache command.

Signed-off-by: Junio C Hamano <junkio@cox.net>

Documentation/git-fsck-cache.txt

@@ -9,7 +9,7 @@ git-fsck-cache - Verifies the connectivity and validity of the objects in the da
 
 SYNOPSIS
 --------
-'git-fsck-cache' [--tags] [--root] [--unreachable] [--cache] [--standalone | --full] [<object>*]
+'git-fsck-cache' [--tags] [--root] [--unreachable] [--cache] [--standalone | --full] [--strict] [<object>*]
 
 DESCRIPTION
 -----------
@@ -53,6 +53,14 @@ OPTIONS
 	and corresponding pack subdirectories in alternate
 	object pools; cannot be used with --standalone.
 
+--strict::
+	Enable more strict checking, namely to catch a file mode
+	recorded with g+w bit set, which was created by older
+	versions of GIT.  Existing repositories, including the
+	Linux kernel, GIT itself, and sparse repository have old
+	objects that triggers this check, but it is recommended
+	to check new projects with this flag.
+
 It tests SHA1 and general object sanity, and it does full tracking of
 the resulting reachability and everything else. It prints out any
 corruption it finds (missing or bad objects), and if you use the

fsck-cache.c

@@ -445,7 +445,7 @@ int main(int argc, char **argv)
 			continue;
 		}
 		if (*arg == '-')
-			usage("git-fsck-cache [--tags] [[--unreachable] [--cache] [--standalone | --full] <head-sha1>*]");
+			usage("git-fsck-cache [--tags] [--root] [[--unreachable] [--cache] [--standalone | --full] [--strict] <head-sha1>*]");
 	}
 
 	if (standalone && check_full)