Diff of /doc/Keybindings-HOWTO [cbef5c] .. [73d623] Maximize Restore

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--- a/doc/Keybindings-HOWTO
+++ b/doc/Keybindings-HOWTO
@@ -141,6 +141,7 @@
     vo_saturation         /* v=int, min, max; revert(), reset() */
     vo_contrast   /* v=int, min, max; revert(), reset() */
     vo_brightness         /* v=int, min, max; revert(), reset() */
+    vo_gamma      /* v=int, min, max; revert(), reset() */
     eq_30         /* v=int, min, max; revert(), reset() */
     eq_60         /* v=int, min, max; revert(), reset() */
     eq_125        /* v=int, min, max; revert(), reset() */