diff --git a/devtools/client/locales/en-US/responsive.properties b/devtools/client/locales/en-US/responsive.properties
index 70e7ddcdbb9e..b9da1ab5b5c3 100644
--- a/devtools/client/locales/en-US/responsive.properties
+++ b/devtools/client/locales/en-US/responsive.properties
@@ -37,6 +37,14 @@ responsive.noDeviceSelected=no device selected
 # toolbar
 responsive.title=Responsive Design Mode
 
+# LOCALIZATION NOTE (responsive.enableTouch): tooltip text for the touch
+# simulation button when it's disabled
+responsive.enableTouch=Enable touch simulation
+
+# LOCALIZATION NOTE (responsive.disableTouch): tooltip text for the touch
+# simulation button when it's enabled
+responsive.disableTouch=Disable touch simulation
+
 # LOCALIZATION NOTE  (responsive.screenshot): tooltip of the screenshot button.
 responsive.screenshot=Take a screenshot of the viewport
 
diff --git a/devtools/client/responsive.html/components/global-toolbar.js b/devtools/client/responsive.html/components/global-toolbar.js
index 640cb2c6830d..68a6d9337723 100644
--- a/devtools/client/responsive.html/components/global-toolbar.js
+++ b/devtools/client/responsive.html/components/global-toolbar.js
@@ -49,6 +49,8 @@ module.exports = createClass({
       dom.button({
         id: "global-touch-simulation-button",
         className: touchButtonClass,
+        title: (touchSimulation.enabled ?
+          getStr("responsive.disableTouch") : getStr("responsive.enableTouch")),
         onClick: () => onUpdateTouchSimulation(!touchSimulation.enabled),
       }),
       dom.button({