diff --git a/lib/oauthstore.php b/lib/oauthstore.php
index 7d2e1f27b6..183164e170 100644
--- a/lib/oauthstore.php
+++ b/lib/oauthstore.php
@@ -54,6 +54,12 @@ class LaconicaOAuthDataStore extends OAuthDataStore
         }
     }
 
+    // http://oauth.net/core/1.0/#nonce
+    // "The Consumer SHALL then generate a Nonce value that is unique for
+    // all requests with that timestamp."
+
+    // XXX: It's not clear why the token is here
+
     function lookup_nonce($consumer, $token, $nonce, $timestamp)
     {
         $n = new Nonce();