Minor
diff --git a/src/hb-ot-math.cc b/src/hb-ot-math.cc
index ec8df2c..eb08bad 100644
--- a/src/hb-ot-math.cc
+++ b/src/hb-ot-math.cc
@@ -120,7 +120,7 @@
 
 /**
  * hb_ot_math_is_glyph_extended_shape:
- * @font: a #hb_font_t to test
+ * @face: a #hb_face_t to test
  * @glyph: a glyph index to test
  *
  * Return value: true if the glyph is an extended shape, false otherwise