diff --git a/src/gui/gui.cpp b/src/gui/gui.cpp
index a4ecae7f8..2fb1933e9 100644
--- a/src/gui/gui.cpp
+++ b/src/gui/gui.cpp
@@ -4970,7 +4970,7 @@ bool FurnaceGUI::loop() {
             case GUI_FILE_INS_SAVE_DMP:
               if (curIns>=0 && curIns<(int)e->song.ins.size()) {
                 if (!e->song.ins[curIns]->saveDMP(copyOfName.c_str())) {
-                  showError("error while saving instrument! make sure your instrument is compatible.");
+                  showError("error while saving instrument! only the following instrument types are supported:\n- FM (OPN)\n- SN76489/Sega PSG\n- Game Boy\n- PC Engine\n- NES\n- C64\n- FM (OPLL)\n- FDS");
                 } else {
                   pushRecentSys(copyOfName.c_str());
                 }