diff --git a/lib/guard/interactor.rb b/lib/guard/interactor.rb
index 5c5fd09..1ef94ca 100644
--- a/lib/guard/interactor.rb
+++ b/lib/guard/interactor.rb
@@ -1,14 +1,29 @@
 module Guard
+
+  # The interactor reads user input and triggers
+  # specific action upon them unless its locked.
+  #
+  # Currently the following actions are implemented:
+  # - stop, quit, exit, s, q, e => Exit Guard
+  # - reload, r, z => Reload Guard
+  # - pause, p => Pause Guard
+  # - Everything else => Run all
+  #
   class Interactor
 
     attr_reader :locked
 
+    # Initialize the interactor in unlocked state.
+    #
     def initialize
       @locked = false
     end
 
+    # Start the interactor in a own thread.
+    #
     def start
       return if ENV["GUARD_ENV"] == 'test'
+
       Thread.new do
         loop do
           if (entry = $stdin.gets) && !@locked
@@ -28,10 +43,14 @@ module Guard
       end
     end
 
+    # Lock the interactor.
+    #
     def lock
       @locked = true
     end
 
+    # Unlock the interactor.
+    #
     def unlock
       @locked = false
     end