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-rw-r--r--src/cmd/diff/main.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/cmd/diff/main.c b/src/cmd/diff/main.c
index d1ed1249..a80f76e1 100644
--- a/src/cmd/diff/main.c
+++ b/src/cmd/diff/main.c
@@ -11,7 +11,7 @@ Biobuf stdout;
static char *tmp[] = {"/tmp/diff1XXXXXXXXXXX", "/tmp/diff2XXXXXXXXXXX"};
static int whichtmp;
static char *progname;
-static char usage[] = "diff [ -efmnbwr ] file1 ... file2\n";
+static char usage[] = "diff [ -acefmnbwr ] file1 ... file2\n";
static void
rmtmpfiles(void)