diff --git a/man3/wcwidth.3 b/man3/wcwidth.3
index 552afbca9..3f70638fa 100644
--- a/man3/wcwidth.3
+++ b/man3/wcwidth.3
@@ -55,7 +55,7 @@ T{
 T}	Thread safety	MT-Safe locale
 .TE
 .SH CONFORMING TO
-POSIX.1-2001.
+POSIX.1-2001, POSIX.1-2008.
 
 Note that glibc before 2.2.5 used the prototype
 .br