diff --git a/bin/_mocha b/bin/_mocha
index f8068835f6..f7a39f2cde 100755
--- a/bin/_mocha
+++ b/bin/_mocha
@@ -90,6 +90,7 @@ program
   .option('--no-timeouts', 'disables timeouts, given implicitly with --debug')
   .option('--opts <path>', 'specify opts path', 'test/mocha.opts')
   .option('--prof', 'log statistical profiling information')
+  .option('--log-timer-events', 'Time events including external callbacks')
   .option('--recursive', 'include sub directories')
   .option('--reporters', 'display available reporters')
   .option('--throw-deprecation', 'throw an exception anytime a deprecated function is used')
diff --git a/bin/mocha b/bin/mocha
index 031ef56bff..47f790e3fe 100755
--- a/bin/mocha
+++ b/bin/mocha
@@ -32,6 +32,7 @@ process.argv.slice(2).forEach(function(arg){
     case '--es_staging':
     case '--no-deprecation':
     case '--prof':
+    case '--log-timer-events':
     case '--throw-deprecation':
     case '--trace-deprecation':
     case '--allow-natives-syntax':