--- Libc/Libc-262/sys/setreuid.2
+++ Libc/Libc-583/sys/setreuid.2
@@ -37,7 +37,7 @@
 .Os
 .Sh NAME
 .Nm setreuid
-.Nd set real and effective user ID's
+.Nd set real and effective user IDs
 .Sh LIBRARY
 .Lb libc
 .Sh SYNOPSIS