diff --git a/man7/feature_test_macros.7 b/man7/feature_test_macros.7
index 7834ed841..99ddcff58 100644
--- a/man7/feature_test_macros.7
+++ b/man7/feature_test_macros.7
@@ -22,7 +22,7 @@
 .\" the source, must acknowledge the copyright and authors of this work.
 .\" %%%LICENSE_END
 .\"
-.TH FEATURE_TEST_MACROS 7 2012-08-05 "Linux" "Linux Programmer's Manual"
+.TH FEATURE_TEST_MACROS 7 2013-09-20 "Linux" "Linux Programmer's Manual"
 .SH NAME
 feature_test_macros \- feature test macros
 .SH SYNOPSIS
@@ -551,6 +551,10 @@ main(int argc, char *argv[])
     printf("_ISOC99_SOURCE defined\\n");
 #endif
 
+#ifdef _ISOC11_SOURCE
+    printf("_ISOC11_SOURCE defined\\n");
+#endif
+
 #ifdef _XOPEN_SOURCE
     printf("_XOPEN_SOURCE defined: %d\\n", _XOPEN_SOURCE);
 #endif