diff --git a/src/backend/distributed/commands/alter_table.c b/src/backend/distributed/commands/alter_table.c
index 547de7257..7a0105231 100644
--- a/src/backend/distributed/commands/alter_table.c
+++ b/src/backend/distributed/commands/alter_table.c
@@ -928,6 +928,11 @@ CopyTableConversionReturnIntoCurrentContext(TableConversionReturn *tableConversi
 static TableConversionReturn *
 ConvertTable(TableConversionState *con)
 {
+	/*
+	 * We do not allow alter_distributed_table and undistribute_table operations
+	  for tables with identity columns. This is because we do not have a proper way
+	  of keeping sequence states consistent across the cluster.
+	 */
 	ErrorIfTableHasIdentityColumn(con->relationId);
 
 	/*