diff --git a/coverage-tool/coverage-reporting/generate_info_file.py b/coverage-tool/coverage-reporting/generate_info_file.py
index 7ab5cdc..20eb0f4 100755
--- a/coverage-tool/coverage-reporting/generate_info_file.py
+++ b/coverage-tool/coverage-reporting/generate_info_file.py
@@ -389,6 +389,7 @@
 for relative_path in file_list:
     abs_path_file = os.path.join(args.workspace, relative_path)
     if not os.path.exists(abs_path_file):
+        print("warning: cannot find '%s'" % abs_path_file)
         continue
     source = open(abs_path_file)
     lines = source.readlines()