diff --git a/source/x265.h b/source/x265.h
--- a/source/x265.h
+++ b/source/x265.h
@@ -1835,17 +1835,17 @@ static const char * const x265_preset_na
  *      with ultrafast mapping to "0" and placebo mapping to "9".  This mapping may
  *      of course change if new presets are added in between, but will always be
  *      ordered from fastest to slowest.
  *
  *      Warning: the speed of these presets scales dramatically.  Ultrafast is a full
  *      100 times faster than placebo!
  *
  *      Currently available tunings are: */
-static const char * const x265_tune_names[] = { "psnr", "ssim", "grain", "zerolatency", "fastdecode", 0 };
+static const char * const x265_tune_names[] = { "psnr", "ssim", "grain", "zerolatency", "animation", "fastdecode", 0 };
 
 /*      returns 0 on success, negative on failure (e.g. invalid preset/tune name). */
 int x265_param_default_preset(x265_param *, const char *preset, const char *tune);
 
 /* x265_picture_alloc:
  *  Allocates an x265_picture instance. The returned picture structure is not
  *  special in any way, but using this method together with x265_picture_free()
  *  and x265_picture_init() allows some version safety. New picture fields will