[docs] Document remaining sections
diff --git a/src/hb-ot-math.cc b/src/hb-ot-math.cc
index c693f48..92c2948 100644
--- a/src/hb-ot-math.cc
+++ b/src/hb-ot-math.cc
@@ -29,6 +29,17 @@
#include "hb-ot-face.hh"
#include "hb-ot-math-table.hh"
+
+/**
+ * SECTION:hb-ot-math
+ * @title: hb-ot-math
+ * @short_description: OpenType Math information
+ * @include: hb-ot.h
+ *
+ * Functions for fetching mathematics layout data from OpenType fonts.
+ **/
+
+
static inline const OT::MATH&
_get_math (hb_face_t *face)
{
