diff --git a/migrations/schema.sql b/migrations/schema.sql
index fad8991f3..b5c2f66d0 100644
--- a/migrations/schema.sql
+++ b/migrations/schema.sql
@@ -63,7 +63,7 @@ CREATE TABLE IF NOT EXISTS clients(
 
 CREATE TABLE IF NOT EXISTS apps(
     id VARCHAR(128) NOT NULL UNIQUE,
-    appStoreId VARCHAR(128) NOT NULL,
+    appStoreId VARCHAR(128) NOT NULL, // empty for custom apps
     installationState VARCHAR(512) NOT NULL, // the active task on the app
     runState VARCHAR(512) NOT NULL,   // if the app is stopped
     health VARCHAR(128),