diff --git a/utils/osnma-log-viewer/osnma_log_viewer.py b/utils/osnma-log-viewer/osnma_log_viewer.py
index b0e487b47..c37d3817c 100755
--- a/utils/osnma-log-viewer/osnma_log_viewer.py
+++ b/utils/osnma-log-viewer/osnma_log_viewer.py
@@ -333,11 +333,15 @@ def main():
             print(f"Supported extensions: {', '.join(valid_extensions)}")
             sys.exit(1)
 
+        print(f"Reading file {log_file} ...")
         df = parse_osnma_log(log_file)
         if df.empty:
             print("No OSNMA authentication records found in the log file.")
             sys.exit(0)
 
+        successful_total_tags = df.shape[0]
+        print(f"Found {successful_total_tags} validated OSNMA tags.")
+
         # Read time limits
         start_datetime = None
         end_datetime = None
@@ -391,6 +395,10 @@ def main():
             )
             sys.exit(0)
 
+        tags_in_period = df.shape[0]
+        if successful_total_tags != tags_in_period:
+            print(f"A total of {tags_in_period} tags will be plotted for the specified time period.")
+
         print(
             "Generating Galileo's navigation message authentication timeline plot ..."
         )