diff --git a/offlineimap.conf b/offlineimap.conf
index 27ad3c6..bd84d6e 100644
--- a/offlineimap.conf
+++ b/offlineimap.conf
@@ -48,6 +48,11 @@
 # expanded in the resulting string. This behaviour is intentional
 # as it coincides with typical shell expansion strategy.
 
+# NOTE 4: multiple same-named sections.
+# The library used to parse the configuration file has known issue when multiple
+# sections have the same name. In such case, only the last section is considered.
+# It is strongly discouraged to have multiple sections with the same name.
+# See https://github.com/OfflineIMAP/offlineimap/issues/143 for more details.
 
 [general]