diff --git a/libs/gtkmm2ext/gtkmm2ext/keyboard.h b/libs/gtkmm2ext/gtkmm2ext/keyboard.h
index dd5a365f32..7b206e2ccc 100644
--- a/libs/gtkmm2ext/gtkmm2ext/keyboard.h
+++ b/libs/gtkmm2ext/gtkmm2ext/keyboard.h
@@ -78,6 +78,8 @@ class LIBGTKMM2EXT_API Keyboard : public sigc::trackable, PBD::Stateful
 	static const char* tertiary_modifier_name ();
 	static const char* level4_modifier_name ();
 
+	static const char* button2_name ();
+
 	static const char* primary_modifier_short_name ();
 	static const char* secondary_modifier_short_name ();
 	static const char* tertiary_modifier_short_name ();
diff --git a/libs/gtkmm2ext/keyboard.cc b/libs/gtkmm2ext/keyboard.cc
index b3ddc79cc6..83dc8c0cad 100644
--- a/libs/gtkmm2ext/keyboard.cc
+++ b/libs/gtkmm2ext/keyboard.cc
@@ -77,6 +77,8 @@ const char* Keyboard::secondary_modifier_name() { return _("Control"); }
 const char* Keyboard::tertiary_modifier_name() { return S_("Key|Shift"); }
 const char* Keyboard::level4_modifier_name() { return _("Option"); }
 
+const char* Keyboard::button2_name() { return _("Middle Click (or Ctrl+Alt+Click)"); }
+
 const char* Keyboard::primary_modifier_short_name() { return _("Cmd"); }
 const char* Keyboard::secondary_modifier_short_name() { return _("Ctrl"); }
 const char* Keyboard::tertiary_modifier_short_name() { return S_("Key|Shift"); }
@@ -100,6 +102,8 @@ const char* Keyboard::secondary_modifier_name() { return _("Alt"); }
 const char* Keyboard::tertiary_modifier_name() { return S_("Key|Shift"); }
 const char* Keyboard::level4_modifier_name() { return _("Windows"); }
 
+const char* Keyboard::button2_name() { return _("Middle-Click"); }
+
 const char* Keyboard::primary_modifier_short_name() { return _("Ctrl"); }
 const char* Keyboard::secondary_modifier_short_name() { return _("Alt"); }
 const char* Keyboard::tertiary_modifier_short_name() { return S_("Key|Shift"); }