diff --git a/gcc/config/rs6000/constraints.md b/gcc/config/rs6000/constraints.md
index 9eb36fe8a8825ba278b8fc74a77bf4ea304633bf..7aaffd9f9a89f96410addb0ff76db9a3cf27b858 100644
--- a/gcc/config/rs6000/constraints.md
+++ b/gcc/config/rs6000/constraints.md
@@ -263,7 +263,7 @@
        (match_test "REG_P (XEXP (op, 0))")))
 
 (define_memory_constraint "Y"
-  "@internal A memory operand for a DQ-form instruction."
+  "@internal A memory operand for a DS-form instruction."
   (and (match_code "mem")
        (match_test "mem_operand_gpr (op, mode)")))