From bf21d2412aff2f02acda602f6fa599c205886c04 Mon Sep 17 00:00:00 2001
From: ahmedk <karim.ahmed@xfel.eu>
Date: Mon, 4 Apr 2022 14:26:24 +0200
Subject: [PATCH] add a comment on parsing file not found error.

---
 src/cal_tools/tools.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/cal_tools/tools.py b/src/cal_tools/tools.py
index 57253fea5..f8e316ccf 100644
--- a/src/cal_tools/tools.py
+++ b/src/cal_tools/tools.py
@@ -358,6 +358,8 @@ def get_dir_creation_date(directory: Union[str, Path], run: int,
     proposal = int(directory.parent.name[1:])
     directory = directory / 'r{:04d}'.format(run)
 
+    # Validate the availability of the input folder.
+    # And show a clear error message, if it was not found.
     try:
         dc = RunDirectory(directory)
     except FileNotFoundError as e:
-- 
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