diff --git a/lib/mocha.js b/lib/mocha.js
index <HASH>..<HASH> 100644
--- a/lib/mocha.js
+++ b/lib/mocha.js
@@ -114,6 +114,10 @@ Mocha.prototype.reporter = function(reporter){
     var _reporter;
     try { _reporter = require('./reporters/' + reporter); } catch (err) {};
     if (!_reporter) try { _repoter = require(reporter); } catch (err) {};
+    if (!_reporter && reporter === 'teamcity')
+      console.warn('The Teamcity reporter was moved to a package named ' +
+        'mocha-teamcity-reporter ' +
+        '(https://npmjs.org/package/mocha-teamcity-reporter).');
     if (!_reporter) throw new Error('invalid reporter "' + reporter + '"');
     this._reporter = _reporter;
   }
console.warn the name and url of the teamcity reporter (#<I>)