diff --git a/man2/setuid.2 b/man2/setuid.2
index c6f870eac..9db028172 100644
--- a/man2/setuid.2
+++ b/man2/setuid.2
@@ -39,7 +39,10 @@ setuid \- set user identity
 .SH DESCRIPTION
 .BR setuid ()
 sets the effective user ID of the calling process.
-If the effective UID of the caller is root,
+If the effective UID of the caller is root
+(more precisely: if the caller has the
+.BR CAP_SETUID
+capability),
 the real UID and saved set-user-ID are also set.
 .PP
 Under Linux,