diff --git a/src/gui/gui.cpp b/src/gui/gui.cpp
index eb0d42717..6a99ad6cb 100644
--- a/src/gui/gui.cpp
+++ b/src/gui/gui.cpp
@@ -4922,6 +4922,12 @@ bool FurnaceGUI::loop() {
         ImGui::EndMenu();
       }
       if (ImGui::BeginMenu(settings.capitalMenuBar?_("Help"):_("help"))) {
+        if (ImGui::MenuItem(_("open manual"))) 
+#ifdef DIV_UNSTABLE
+          SDL_OpenURL("https://github.com/tildearrow/furnace/tree/master/doc");
+#else
+          SDL_OpenURL("https://tildearrow.org/furnace/doc/v" DIV_VERSION "/manual.pdf");
+#endif
         if (ImGui::MenuItem(_("effect list"),BIND_FOR(GUI_ACTION_WINDOW_EFFECT_LIST),effectListOpen)) effectListOpen=!effectListOpen;
         if (ImGui::MenuItem(_("debug menu"),BIND_FOR(GUI_ACTION_WINDOW_DEBUG))) debugOpen=!debugOpen;
         if (ImGui::MenuItem(_("inspector"))) inspectorOpen=!inspectorOpen;