Add or update tables specifications links
diff --git a/src/hb-ot-layout-base-table.hh b/src/hb-ot-layout-base-table.hh
index 20b8bd7..33dce89 100644
--- a/src/hb-ot-layout-base-table.hh
+++ b/src/hb-ot-layout-base-table.hh
@@ -36,7 +36,8 @@
 #define NOT_INDEXED   ((unsigned int) -1)
 
 /*
- * BASE -- The BASE Table
+ * BASE -- Baseline
+ * https://docs.microsoft.com/en-us/typography/opentype/spec/base
  */
 
 struct BaseCoordFormat1