Signed-off-by: Alejandro Colomar <alx@kernel.org>
---
 man2/request_key.2 | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/man2/request_key.2 b/man2/request_key.2
index 78493b640..b9c4f2a00 100644
--- a/man2/request_key.2
+++ b/man2/request_key.2
@@ -15,7 +15,7 @@ .SH SYNOPSIS
 .B #include <keyutils.h>
 .PP
 .BI "key_serial_t request_key(const char *" type ", const char *" description ,
-.BI "                         const char *" callout_info ,
+.BI "                         const char *_Nullable " callout_info ,
 .BI "                         key_serial_t " dest_keyring );
 .fi
 .SH DESCRIPTION
-- 
2.38.1