diff --git a/src/activities/lightsoff/ActivityInfo.qml b/src/activities/lightsoff/ActivityInfo.qml
index 15a701018..eb72805d3 100644
--- a/src/activities/lightsoff/ActivityInfo.qml
+++ b/src/activities/lightsoff/ActivityInfo.qml
@@ -1,40 +1,40 @@
 /* GCompris - ActivityInfo.qml
  *
  * Copyright (C) 2015 Stephane Mankowski <stephane@mankowski.fr>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 3 of the License, or
  * (at your option) any later version.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, see <https://www.gnu.org/licenses/>.
  */
 import GCompris 1.0
 
 ActivityInfo {
   name: "lightsoff/Lightsoff.qml"
   difficulty: 6
   icon: "lightsoff/lightsoff.svg"
   author: "Stephane Mankowski &lt;stephane@mankowski.fr&gt;"
   demo: true
   //: Activity title
   title: qsTr("Lights Off")
   //: Help title
   description: qsTr("The aim is to switch off all the lights.")
 //  intro: "Click on the lamps to turn them off."
   //: Help goal
   goal: qsTr("The aim is to switch off all the lights.")
   //: Help prerequisite
   prerequisite: ""
   //: Help manual
-  manual: qsTr("The effect of pressing a button is to toggle the state of that button, and of its immediate vertical and horizontal neighbors. The sun and the color of the sky depend on the number of clicks needed to solve the puzzle. If you click on Tux, the solution is shown.")
+  manual: qsTr("The effect of pressing a window is to toggle the state of that window, and of its immediate vertical and horizontal neighbors. The sun and the color of the sky depend on the number of clicks needed to solve the puzzle. If you click on Tux, the solution is shown.")
   credit: qsTr("The solver algorithm is described on Wikipedia. To know more about the Lights Off game: &lt;http://en.wikipedia.org/wiki/Lights_Out_(game)&gt;")
   section: "discovery logic"
   createdInVersion: 0
 }