diff --git a/INSTALL.txt b/INSTALL.txt
index b94dd9c147f9ded3d33431ac940d002b4b3badda..b43b6368c5a6edf8f08b4703be74655916ea5941 100644
--- a/INSTALL.txt
+++ b/INSTALL.txt
@@ -14,6 +14,10 @@ Checkout the OMDev package:
 VERY IMPORTANT INSTALLATION ISSUES!
 ***********************************
 
+Note: 
+The master version will not work on 32bit computers and operating systems.
+Use the old OMDev for that, branch: OM116maintenance
+
 MSYS setting
 ============
 To make things move fast in msys2 one has to generate the group and passwd files on the host.