1 files changed, 9 insertions, 0 deletions

diff --git a/include/usage.h b/include/usage.h
index c68ae2e0d..ce8d407e3 100644
--- a/include/usage.h
+++ b/include/usage.h
@@ -222,6 +222,15 @@
         "\t\t  for all differing bytes\n" \
         "\t-s\tquiet mode - do not print"
 
+#define comm_trivial_usage \
+        "[-123] FILE1 FILE2"
+#define comm_full_usage \
+        "Compare files. Compares FILE1 to FILE2, or to stdin if - is specified.\n\n" \
+        "Options:\n" \
+        "\t-1\tSuppress lines unique to FILE1\n" \
+        "\t-2\tSuppress lines unique to FILE2\n" \
+        "\t-3\tSuppress lines common to both files"
+
 #define cp_trivial_usage \
         "[OPTION]... SOURCE DEST"
 #define cp_full_usage \