1 files changed, 22 insertions, 0 deletions

diff --git a/editors/diff.c b/editors/diff.c
index 3719bb49f..daa58af9b 100644
--- a/editors/diff.c
+++ b/editors/diff.c
@@ -76,6 +76,28 @@
  * 6n words for files of length n.
  */
 
+//usage:#define diff_trivial_usage
+//usage:       "[-abBdiNqrTstw] [-L LABEL] [-S FILE] [-U LINES] FILE1 FILE2"
+//usage:#define diff_full_usage "\n\n"
+//usage:       "Compare files line by line and output the differences between them.\n"
+//usage:       "This implementation supports unified diffs only.\n"
+//usage:     "\nOptions:"
+//usage:     "\n        -a      Treat all files as text"
+//usage:     "\n        -b      Ignore changes in the amount of whitespace"
+//usage:     "\n        -B      Ignore changes whose lines are all blank"
+//usage:     "\n        -d      Try hard to find a smaller set of changes"
+//usage:     "\n        -i      Ignore case differences"
+//usage:     "\n        -L      Use LABEL instead of the filename in the unified header"
+//usage:     "\n        -N      Treat absent files as empty"
+//usage:     "\n        -q      Output only whether files differ"
+//usage:     "\n        -r      Recurse"
+//usage:     "\n        -S      Start with FILE when comparing directories"
+//usage:     "\n        -T      Make tabs line up by prefixing a tab when necessary"
+//usage:     "\n        -s      Report when two files are the same"
+//usage:     "\n        -t      Expand tabs to spaces in output"
+//usage:     "\n        -U      Output LINES lines of context"
+//usage:     "\n        -w      Ignore all whitespace"
+
 #include "libbb.h"
 
 #if 0