--- a/src/java.desktop/share/native/libfontmanager/harfbuzz/hb-ft.h	Tue Dec 05 11:04:42 2017 -0800
+++ b/src/java.desktop/share/native/libfontmanager/harfbuzz/hb-ft.h	Thu Dec 07 11:55:06 2017 -0800
@@ -116,7 +116,13 @@
 HB_EXTERN int
 hb_ft_font_get_load_flags (hb_font_t *font);
 
-/* Makes an hb_font_t use FreeType internally to implement font functions. */
+/* Call when size or variations settings on underlying FT_Face change. */
+HB_EXTERN void
+hb_ft_font_changed (hb_font_t *font);
+
+/* Makes an hb_font_t use FreeType internally to implement font functions.
+ * Note: this internally creates an FT_Face.  Use it when you create your
+ * hb_face_t using hb_face_create(). */
 HB_EXTERN void
 hb_ft_font_set_funcs (hb_font_t *font);