diff --git a/app/index.py b/app/index.py
index c914798..c4cb6de 100644
--- a/app/index.py
+++ b/app/index.py
@@ -20,6 +20,7 @@ def addreminder():
     hours = form.hours.data
     minutes = form.minutes.data
     try:
+        # try to read ics file
         calendar = Calendar.from_ical(file.read())
     except ValueError:
         error = 'can\'t read file'