Signed-off-by: Alejandro Colomar <alx@kernel.org>
---
 man2/sigaltstack.2 | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/man2/sigaltstack.2 b/man2/sigaltstack.2
index ca41491eb..a448da43c 100644
--- a/man2/sigaltstack.2
+++ b/man2/sigaltstack.2
@@ -13,8 +13,8 @@ .SH SYNOPSIS
 .nf
 .B #include <signal.h>
 .PP
-.BI "int sigaltstack(const stack_t *restrict " ss \
-", stack_t *restrict " old_ss );
+.BI "int sigaltstack(const stack_t *_Nullable restrict " ss ,
+.BI "                stack_t *_Nullable restrict " old_ss );
 .fi
 .PP
 .RS -4
-- 
2.38.1