diff --git a/stb_truetype.h b/stb_truetype.h
index 783ecfa..667da88 100644
--- a/stb_truetype.h
+++ b/stb_truetype.h
@@ -2136,7 +2136,7 @@ static int stbtt__run_charstring(const stbtt_fontinfo *info, int glyph_index, st
                subrs = stbtt__cid_get_glyph_subrs(info, glyph_index);
             has_subrs = 1;
          }
-         // fallthrough
+         // FALLTHROUGH
       case 0x1D: // callgsubr
          if (sp < 1) return STBTT__CSERR("call(g|)subr stack");
          v = (int) s[--sp];