diff --git a/src/include/access/tupdesc.h b/src/include/access/tupdesc.h
index fbbdc8b2a..a12d3f726 100644
--- a/src/include/access/tupdesc.h
+++ b/src/include/access/tupdesc.h
@@ -26,6 +26,7 @@
 
 /*
  * Total number of different Table Access Method types.
+ Describe basic information
  */
 const int NUM_TABLE_AM = 2;