diff --git a/reference/array/functions/array-filter.xml b/reference/array/functions/array-filter.xml
index 895e2f1720..4d9853b75a 100644
--- a/reference/array/functions/array-filter.xml
+++ b/reference/array/functions/array-filter.xml
@@ -80,11 +80,13 @@
 <?php
 function odd($var)
 {
+    // returns whether the input integer is odd
     return($var & 1);
 }
 
 function even($var)
 {
+    // returns whether the input integer is even
     return(!($var & 1));
 }