diff --git a/gcc/cp/cp-tree.def b/gcc/cp/cp-tree.def
index 1454802bf68..99851eb780f 100644
--- a/gcc/cp/cp-tree.def
+++ b/gcc/cp/cp-tree.def
@@ -594,9 +594,9 @@ DEFTREECODE (CO_YIELD_EXPR, "co_yield", tcc_expression, 2)
 /* The co_return expression is used to support coroutines.
 
    Op0 is the original expr, can be void (for use in diagnostics)
-   Op2 is the promise return_xxxx call for Op0. */
+   Op1 is the promise return_xxxx call for for the expression given. */
 
-DEFTREECODE (CO_RETURN_EXPR, "co_return", tcc_expression, 2)
+DEFTREECODE (CO_RETURN_EXPR, "co_return", tcc_statement, 2)
 
 /*
 Local variables: