diff --git a/example.cfg b/example.cfg
index 4f62ecc..f50ba2e 100644
--- a/example.cfg
+++ b/example.cfg
@@ -14,7 +14,9 @@ status_path = ~/.vdirsyncer/status/
 
 # CONTACTS
 [pair bob_contacts]
-# Similar to accounts in OfflineIMAP.
+# A `[pair <name>]` block defines two storages `a` and `b` that should be
+# synchronized. The definition of these storages follows in `[storage <name>]`
+# blocks. This is similar to accounts in OfflineIMAP.
 a = bob_contacts_local
 b = bob_contacts_remote