--- a/tests/test-help.t	Thu Nov 13 00:08:44 2014 -0800
+++ b/tests/test-help.t	Thu Nov 13 00:13:48 2014 -0800
@@ -500,6 +500,7 @@
    -a --text                treat all files as text
    -g --git                 use git extended diff format
       --nodates             omit dates from diff headers
+      --noprefix            omit a/ and b/ prefixes from filenames
    -p --show-function       show which function each change is in
       --reverse             produce a diff that undoes the changes
    -w --ignore-all-space    ignore white space when comparing lines