correct typo

diff --git a/doc/plugins/openid.mdwn b/doc/plugins/openid.mdwn
index f3b3abfbb6cd8af0203d522ca13d07201a3d540b..d56d1a396b8b505e424d272d8d93bae4dd3eb455 100644 (file)
--- a/doc/plugins/openid.mdwn
+++ b/doc/plugins/openid.mdwn
@@ -17,7 +17,7 @@ only use some other form of authentication, such as [[passwordauth]].
 ## options
 
 These options do not normally need to be set, but can be useful in
-certian setups.
+certain setups.
 
 * `openid_realm` can be used to control the scope of the openid request.
   It defaults to the `cgiurl` (or `openid_cgiurl` if set); only allowing