diff --git a/reference/curl/functions/curl-setopt.xml b/reference/curl/functions/curl-setopt.xml
index 6d8c6d7916..1363b0afa8 100644
--- a/reference/curl/functions/curl-setopt.xml
+++ b/reference/curl/functions/curl-setopt.xml
@@ -723,8 +723,16 @@
           <row>
            <entry valign="top"><constant>CURLOPT_SSLVERSION</constant></entry>
            <entry valign="top">
-            The SSL version (2 or 3) to use. By default PHP will try to determine
-            this itself, although in some cases this must be set manually.
+            One of <constant>CURL_SSLVERSION_DEFAULT</constant> (0),
+            <constant>CURL_SSLVERSION_TLSv1</constant> (1),
+            <constant>CURL_SSLVERSION_SSLv2</constant> (2) or
+            <constant>CURL_SSLVERSION_SSLv3</constant> (3).
+            <note>
+             <para>
+              Setting this to anything other than 0 or 1 is dangerous given
+              the known vulnerabilities in SSLv2 and SSLv3.
+             </para>
+            </note>
            </entry>
            <entry valign="top">
            </entry>