diff --git a/scripts/release-win.sh b/scripts/release-win.sh
index 07d422255..eecabcb89 100755
--- a/scripts/release-win.sh
+++ b/scripts/release-win.sh
@@ -1,5 +1,6 @@
 #!/bin/bash
 # make Windows release
+# this script shall be run from Linux with MinGW installed!
 
 if [ ! -e /tmp/furnace ]; then
   ln -s "$PWD" /tmp/furnace || exit 1