diff --git a/rtdata/languages/default b/rtdata/languages/default
index da4d5c804..5004bf25c 100644
--- a/rtdata/languages/default
+++ b/rtdata/languages/default
@@ -225,6 +225,7 @@ GENERAL_DISABLED;Disabled
 GENERAL_ENABLE;Enable
 GENERAL_ENABLED;Enabled
 GENERAL_FILE;File
+GENERAL_HELP;Help
 GENERAL_LANDSCAPE;Landscape
 GENERAL_NA;n/a
 GENERAL_NO;No
diff --git a/rtgui/rtwindow.cc b/rtgui/rtwindow.cc
index 5ab3ab85d..7f3c409a6 100644
--- a/rtgui/rtwindow.cc
+++ b/rtgui/rtwindow.cc
@@ -383,8 +383,13 @@ RTWindow::RTWindow ()
         iccProfileCreator->set_tooltip_markup (M ("MAIN_BUTTON_ICCPROFCREATOR"));
         iccProfileCreator->signal_clicked().connect ( sigc::mem_fun (*this, &RTWindow::showICCProfileCreator) );
 
-        //Gtk::LinkButton* rtWeb = Gtk::manage (new Gtk::LinkButton ("http://rawtherapee.com"));   // unused... but fail to be linked anyway !?
-        //Gtk::Button* preferences = Gtk::manage (new Gtk::Button (M("MAIN_BUTTON_PREFERENCES")+"..."));
+        Gtk::Button* helpBtn = Gtk::manage (new Gtk::Button ());
+        setExpandAlignProperties (helpBtn, false, false, Gtk::ALIGN_CENTER, Gtk::ALIGN_CENTER);
+        helpBtn->set_relief(Gtk::RELIEF_NONE);
+        helpBtn->set_image (*Gtk::manage (new RTImage ("info.png")));
+        helpBtn->set_tooltip_markup (M ("GENERAL_HELP"));
+        helpBtn->signal_clicked().connect (sigc::mem_fun (*this, &RTWindow::showRawPedia));
+
         Gtk::Button* preferences = Gtk::manage (new Gtk::Button ());
         setExpandAlignProperties (preferences, false, false, Gtk::ALIGN_CENTER, Gtk::ALIGN_CENTER);
         preferences->set_relief(Gtk::RELIEF_NONE);
@@ -392,7 +397,6 @@ RTWindow::RTWindow ()
         preferences->set_tooltip_markup (M ("MAIN_BUTTON_PREFERENCES"));
         preferences->signal_clicked().connect ( sigc::mem_fun (*this, &RTWindow::showPreferences) );
 
-        //btn_fullscreen = Gtk::manage( new Gtk::Button(M("MAIN_BUTTON_FULLSCREEN")));
         btn_fullscreen = Gtk::manage ( new Gtk::Button());
         setExpandAlignProperties (btn_fullscreen, false, false, Gtk::ALIGN_CENTER, Gtk::ALIGN_CENTER);
         btn_fullscreen->set_relief(Gtk::RELIEF_NONE);
@@ -414,6 +418,7 @@ RTWindow::RTWindow ()
             actionGrid->set_orientation (Gtk::ORIENTATION_VERTICAL);
             actionGrid->attach_next_to (prProgBar, Gtk::POS_BOTTOM, 1, 1);
             actionGrid->attach_next_to (*iccProfileCreator, Gtk::POS_BOTTOM, 1, 1);
+            actionGrid->attach_next_to (*helpBtn, Gtk::POS_BOTTOM, 1, 1);
             actionGrid->attach_next_to (*preferences, Gtk::POS_BOTTOM, 1, 1);
             actionGrid->attach_next_to (*btn_fullscreen, Gtk::POS_BOTTOM, 1, 1);
             mainNB->set_action_widget (actionGrid, Gtk::PACK_END);
@@ -422,6 +427,7 @@ RTWindow::RTWindow ()
             actionGrid->set_orientation (Gtk::ORIENTATION_HORIZONTAL);
             actionGrid->attach_next_to (prProgBar, Gtk::POS_RIGHT, 1, 1);
             actionGrid->attach_next_to (*iccProfileCreator, Gtk::POS_RIGHT, 1, 1);
+            actionGrid->attach_next_to (*helpBtn, Gtk::POS_RIGHT, 1, 1);
             actionGrid->attach_next_to (*preferences, Gtk::POS_RIGHT, 1, 1);
             actionGrid->attach_next_to (*btn_fullscreen, Gtk::POS_RIGHT, 1, 1);
             mainNB->set_action_widget (actionGrid, Gtk::PACK_END);
@@ -913,6 +919,14 @@ void RTWindow::writeToolExpandedStatus (std::vector<int> &tpOpen)
 }
 
 
+void RTWindow::showRawPedia()
+{
+    const Glib::ustring& uri = "https://rawpedia.rawtherapee.com/";
+    guint32 err = 0;
+    RTWindow *rtWin = this;
+    rtWin->show_uri(uri, err);
+}
+
 void RTWindow::showICCProfileCreator ()
 {
     ICCProfileCreator *iccpc = new ICCProfileCreator (this);
diff --git a/rtgui/rtwindow.h b/rtgui/rtwindow.h
index 100ddf636..4791ac6c1 100644
--- a/rtgui/rtwindow.h
+++ b/rtgui/rtwindow.h
@@ -90,6 +90,7 @@ public:
     bool on_window_state_event (GdkEventWindowState* event) override;
     void on_mainNB_switch_page (Gtk::Widget* widget, guint page_num);
 
+    void showRawPedia();
     void showICCProfileCreator ();
     void showPreferences ();
     void on_realize () override;