diff --git a/lib/models/user.js b/lib/models/user.js
index 61a67313..7a062da7 100644
--- a/lib/models/user.js
+++ b/lib/models/user.js
@@ -144,24 +144,24 @@ User.login = function (credentials, fn) {
     var defaultError = new Error('login failed');
     
     if(err) {
-      debug('User: error reported from User.findOne: %j', err);
+      debug('An error is reported from User.findOne: %j', err);
       fn(defaultError);
     } else if(user) {
       user.hasPassword(credentials.password, function(err, isMatch) {
         if(err) {
-          debug('User: error reported from User.hasPassword: %j', err);
+          debug('An error is reported from User.hasPassword: %j', err);
           fn(defaultError);
         } else if(isMatch) {
           user.accessTokens.create({
             ttl: Math.min(credentials.ttl || User.settings.ttl, User.settings.maxTTL)
           }, fn);
         } else {
-          debug('User: invalid password for user %s', query.email || query.username);
+          debug('The password is invalid for user %s', query.email || query.username);
           fn(defaultError);
         }
       });
     } else {
-      debug('User: no matching record found for user %s', query.email || query.username);
+      debug('No matching record is found for user %s', query.email || query.username);
       fn(defaultError);
     }
   });