Add 'rm -f' equivalent to 'git rm' example of filter-branch --index-filter

diff --git a/contrib/difftool/git-difftool b/contrib/difftool/git-difftool
index 1fc087c5fc99962cc3b62810e4df97ebf7439a0c..0cda3d2eeae3054d1835676d198e3aae01288259 100755 (executable)
--- a/contrib/difftool/git-difftool
+++ b/contrib/difftool/git-difftool
@@ -4,7 +4,7 @@
 # This is a wrapper around the GIT_EXTERNAL_DIFF-compatible
 # git-difftool-helper script.  This script exports
 # GIT_EXTERNAL_DIFF and GIT_PAGER for use by git, and
-# GIT_NO_PROMPT and GIT_MERGE_TOOL for use by git-difftool-helper.
+# GIT_DIFFTOOL_NO_PROMPT and GIT_MERGE_TOOL for use by git-difftool-helper.
 # Any arguments that are unknown to this script are forwarded to 'git diff'.
 
 use strict;
@@ -18,8 +18,7 @@ my $DIR = abs_path(dirname($0));
 sub usage
 {
        print << 'USAGE';
-
-usage: git difftool [--no-prompt] [--tool=tool] ["git diff" options]
+usage: git difftool [--tool=<tool>] [--no-prompt] ["git diff" options]
 USAGE
        exit 1;
 }