diff --git a/docs/libcurl/opts/CURLOPT_POSTREDIR.3 b/docs/libcurl/opts/CURLOPT_POSTREDIR.3
index cacb0aaa43d329..b9660a94404ee0 100644
--- a/docs/libcurl/opts/CURLOPT_POSTREDIR.3
+++ b/docs/libcurl/opts/CURLOPT_POSTREDIR.3
@@ -52,7 +52,7 @@ HTTP
 TODO
 .SH AVAILABILITY
 Added in 7.17.1. This option was known as CURLOPT_POST301 up to 7.19.0 as it
-only supported the 301 then.
+only supported the 301 then. CURL_REDIR_POST_303 was added in 7.26.0.
 .SH RETURN VALUE
 Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
 .SH "SEE ALSO"