diff --git a/src/hb-ot-layout.cc b/src/hb-ot-layout.cc
index 2572c0073..879266d76 100644
--- a/src/hb-ot-layout.cc
+++ b/src/hb-ot-layout.cc
@@ -641,8 +641,8 @@ hb_ot_layout_position_finish (hb_font_t *font, hb_buffer_t *buffer, hb_bool_t ze
 }
 
 hb_bool_t
-hb_ot_layout_position_get_size (hb_face_t *face,
-				uint16_t  *data /* OUT, 5 items */)
+hb_ot_layout_get_size_params (hb_face_t *face,
+			      uint16_t  *data /* OUT, 5 items */)
 {
   const OT::GPOS &gpos = _get_gpos (face);
   unsigned int script_index;
diff --git a/src/hb-ot-layout.h b/src/hb-ot-layout.h
index adb483ce9..8999eaf69 100644
--- a/src/hb-ot-layout.h
+++ b/src/hb-ot-layout.h
@@ -277,10 +277,11 @@ Xhb_ot_layout_lookup_position (hb_font_t            *font,
 			      hb_glyph_position_t  *positions /* IN / OUT */);
 #endif
 
-/* Optical 'size' feature info.  Returns true if found. */
+/* Optical 'size' feature info.  Returns true if found.
+ * XXX Add URL. */
 hb_bool_t
-hb_ot_layout_position_get_size (hb_face_t *face,
-				uint16_t  *data /* OUT, 5 items */);
+hb_ot_layout_get_size_params (hb_face_t *face,
+			      uint16_t  *data /* OUT, 5 items */);
 
 
 HB_END_DECLS