1.9.0
diff --git a/src/hb-unicode.h b/src/hb-unicode.h
index 226c5d5..c8d87e4 100644
--- a/src/hb-unicode.h
+++ b/src/hb-unicode.h
@@ -40,6 +40,11 @@
 HB_BEGIN_DECLS
 
 
+/**
+ * HB_UNICODE_MAX
+ *
+ * Since: 1.9.0
+ */
 #define HB_UNICODE_MAX 0x10FFFFu