diff --git a/lib/mocha/api.rb b/lib/mocha/api.rb
index 99e7d203..19603492 100644
--- a/lib/mocha/api.rb
+++ b/lib/mocha/api.rb
@@ -171,6 +171,7 @@ def sequence(name)
     #
     # A test can contain multiple state machines.
     #
+    # @param [String] name name of state machine
     # @return [StateMachine] a new state machine
     #
     # @see Expectation#then