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-rw-r--r--include/freetype/ftmm.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/freetype/ftmm.h b/include/freetype/ftmm.h
index 7a25e2dba..c74ce618c 100644
--- a/include/freetype/ftmm.h
+++ b/include/freetype/ftmm.h
@@ -47,6 +47,9 @@ FT_BEGIN_HEADER
* MM fonts, others will work with all three types. They are similar
* enough that a consistent interface makes sense.
*
+ * For Adobe MM fonts, macro @FT_IS_SFNT returns false. For GX and
+ * OpenType variation fonts, it returns true.
+ *
*/