diff --git a/etiquette/constants.py b/etiquette/constants.py
index d0fc1f1..2df876f 100644
--- a/etiquette/constants.py
+++ b/etiquette/constants.py
@@ -57,6 +57,7 @@ BEGIN;
 {DB_PRAGMAS}
 {DB_VERSION_PRAGMA}
 ----------------------------------------------------------------------------------------------------
+-- users table is defined first because other tables have foreign keys here.
 CREATE TABLE IF NOT EXISTS users(
     id TEXT PRIMARY KEY NOT NULL,
     username TEXT NOT NULL COLLATE NOCASE,