documentation: add tutorial for first contribution

diff --git a/Documentation/diff-options.txt b/Documentation/diff-options.txt
index 5ebc56867bf8323c2715389875c2ea732b5c2ba8..09faee3b44db2e78ba909d30c62ff105255c7832 100644 (file)
--- a/Documentation/diff-options.txt
+++ b/Documentation/diff-options.txt
@@ -436,7 +436,7 @@ endif::git-format-patch[]
 
 --binary::
        In addition to `--full-index`, output a binary diff that
-       can be applied with `git-apply`.
+       can be applied with `git-apply`. Implies `--patch`.
 
 --abbrev[=<n>]::
        Instead of showing the full 40-byte hexadecimal object