--- a/changelog	Sun Dec 03 18:54:55 2017 +0100
+++ b/changelog	Mon Dec 04 16:25:40 2017 +0100
@@ -2,6 +2,9 @@
 ----------
 Version 18.01:
 - bug fixes
+- Project
+  -- If a project does not contain protobuf files, the old project file format
+     (5.1) is generated to make the file backward compatible.
 
 Version 17.12:
 - bug fixes