diff --git a/guacamole/src/main/webapp/app/client/controllers/clientController.js b/guacamole/src/main/webapp/app/client/controllers/clientController.js
index 0b9ad5f2f..6e4f27509 100644
--- a/guacamole/src/main/webapp/app/client/controllers/clientController.js
+++ b/guacamole/src/main/webapp/app/client/controllers/clientController.js
@@ -192,8 +192,8 @@ angular.module('client').controller('clientController', ['$scope', '$routeParams
         autoFit : true,
 
         /**
-         * The currently selected input method. This may be either "none",
-         * "osk", or "text".
+         * The currently selected input method. This may be any of the values
+         * defined within preferenceService.inputMethods.
          *
          * @type String
          */
diff --git a/guacamole/src/main/webapp/app/settings/services/preferenceService.js b/guacamole/src/main/webapp/app/settings/services/preferenceService.js
index ab946908b..ade3c7228 100644
--- a/guacamole/src/main/webapp/app/settings/services/preferenceService.js
+++ b/guacamole/src/main/webapp/app/settings/services/preferenceService.js
@@ -36,6 +36,43 @@ angular.module('settings').factory('preferenceService', ['$injector',
     // The parameter name for getting the history from local storage
     var GUAC_PREFERENCES_STORAGE_KEY = "GUAC_PREFERENCES";
 
+    /**
+     * All valid input method type names.
+     *
+     * @type Object.<String, String>
+     */
+    service.inputMethods = {
+
+        /**
+         * No input method is used. Keyboard events are generated from a
+         * physical keyboard.
+         *
+         * @constant
+         * @type String
+         */
+        NONE : 'none',
+
+        /**
+         * Keyboard events will be generated from the Guacamole on-screen
+         * keyboard.
+         *
+         * @constant
+         * @type String
+         */
+        OSK : 'osk',
+
+        /**
+         * Keyboard events will be generated by inferring the keys necessary to
+         * produce typed text from an IME (Input Method Editor) such as the
+         * native on-screen keyboard of a mobile device.
+         *
+         * @constant
+         * @type String
+         */
+        TEXT : 'text'
+
+    };
+
     /**
      * All currently-set preferences, as name/value pairs. Each property name
      * corresponds to the name of a preference.
@@ -53,12 +90,12 @@ angular.module('settings').factory('preferenceService', ['$injector',
         emulateAbsoluteMouse : true,
 
         /**
-         * The default input method. This may be either "none", "osk", or
-         * "text".
+         * The default input method. This may be any of the values defined
+         * within preferenceService.inputMethods.
          *
          * @type String
          */
-        inputMethod : 'none'
+        inputMethod : service.inputMethods.NONE
 
     };