diff --git a/.vscode/settings.json b/.vscode/settings.json
new file mode 100644
index 0000000..7a73a41
--- /dev/null
+++ b/.vscode/settings.json
@@ -0,0 +1,2 @@
+{
+}
\ No newline at end of file
diff --git a/src/query.js b/src/query.js
index d00441b..d80716e 100644
--- a/src/query.js
+++ b/src/query.js
@@ -19,9 +19,9 @@ export function query(from = 0, delta = 1) {
 
   return {
     subscribe: counter.subscribe,
-    update: (delta) => {
+    set delta(value) {
       clearInterval(interval);
-      interval = timer(delta);
-    },
+      interval = timer(value);
+    }
   }
 }
diff --git a/src/stores.js b/src/stores.js
index 0a08cc9..a16dcc9 100644
--- a/src/stores.js
+++ b/src/stores.js
@@ -17,7 +17,7 @@ export const stream = vcDerived([from, delta], ([$from, $delta, fired], set) =>
     unsubscribe = qry.subscribe(set);
   } else {
     console.log('callback: query update counter stream delta', $delta, 'fired:', fired);
-    qry.update($delta)
+    qry.delta = $delta;
   }
   // cleanup / stop
   return (fired) => {	// fired: null or store_id (pending)