diff --git a/reference/curl/functions/curl-setopt.xml b/reference/curl/functions/curl-setopt.xml
index 51f4926d91..d382647736 100644
--- a/reference/curl/functions/curl-setopt.xml
+++ b/reference/curl/functions/curl-setopt.xml
@@ -67,6 +67,7 @@
             <constant>CURLOPT_RETURNTRANSFER</constant> is used.
            </entry>
            <entry valign="top">
+           Obselete since PHP 5.1.3
            </entry>
           </row>
           <row>