diff --git a/gcc/tree.def b/gcc/tree.def
index 087265459b7..e639a039db9 100644
--- a/gcc/tree.def
+++ b/gcc/tree.def
@@ -1341,8 +1341,7 @@ DEFTREECODE (WIDEN_SUM_EXPR, "widen_sum_expr", tcc_binary, 2)
    The first two arguments are of type t1 which should be integer.
    The third argument and the result are of type t2, such that t2 is at least
    twice the size of t1.  Like DOT_PROD_EXPR, SAD_EXPR (arg1,arg2,arg3) is
-   equivalent to (note we don't have WIDEN_MINUS_EXPR now, but we assume its
-   behavior is similar to WIDEN_SUM_EXPR):
+   equivalent to:
        tmp = WIDEN_MINUS_EXPR (arg1, arg2)
        tmp2 = ABS_EXPR (tmp)
        arg3 = PLUS_EXPR (tmp2, arg3)