diff --git a/helpers/db-unchanged.js b/helpers/db-unchanged.js
index 4625a80..49bd73f 100644
--- a/helpers/db-unchanged.js
+++ b/helpers/db-unchanged.js
@@ -1,3 +1,7 @@
+// when data changes, realm gives us an object with updates
+// https://realm.io/docs/javascript/latest/#collection-notifications
+// but it sometimes gets fired even though there are no changes
+// - we want to check for that and see if all arrays are empty
 export default function (dbChanges) {
   return Object.values(dbChanges).every(changeArray => changeArray.length === 0)
 }
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