diff --git a/exploration/expl_esm.py b/exploration/expl_esm.py
index ae7fd32..5f469f4 100644
--- a/exploration/expl_esm.py
+++ b/exploration/expl_esm.py
@@ -51,6 +51,10 @@ df_esm_preprocessed.columns
 
 # %% [markdown]
 # The purpose of concordance is to count the number of EMA sessions that a participant answered in a day and possibly compare it to some maximum number of EMAs that could theoretically be presented for that day.
+# Traditionally, concordance (adherence) in EMA study is simply calculated as the ratio of (daily) answered EMAs.
+# This is possible for studies with simple EMA design, such that they are presented at fixed schedule and expired within a certain limit.
+#
+# Since EMAs were triggered more flexibly in our study, a different approach is needed.
 
 # %% [markdown]
 # ## Session IDs