diff --git a/man2/sigaltstack.2 b/man2/sigaltstack.2
index 6fccb4038..60b14d0da 100644
--- a/man2/sigaltstack.2
+++ b/man2/sigaltstack.2
@@ -158,8 +158,7 @@ outside of the process's address space.
 .TP
 .B EINVAL
 \fIss\fP is not NULL and the \fIss_flags\fP field contains
-a nonzero value other than
-.BR SS_DISABLE .
+an invalid flag.
 .TP
 .B ENOMEM
 The specified size of the new alternate signal stack