diff --git a/reference/datetime/functions/strptime.xml b/reference/datetime/functions/strptime.xml
index 3cdae635b4..65a78342d2 100644
--- a/reference/datetime/functions/strptime.xml
+++ b/reference/datetime/functions/strptime.xml
@@ -178,6 +178,13 @@ Array
        on leap seconds</link>.
       </para>
      </note>
+     <note>
+      <para>
+       Prior to PHP 5.2.0, this function could return undefined behaviour. Notable 
+       the <literal>"tm_sec"</literal>, <literal>"tm_min"</literal> and <literal>"tm_hour"</literal> 
+       entries would return undefined values.
+      </para>
+     </note>
     </refsect1>
 
     <refsect1 role="seealso">