diff --git a/rfcs/0005-standard-signals.md b/rfcs/0005-standard-signals.md
index 436d45d..80ab24b 100644
--- a/rfcs/0005-standard-signals.md
+++ b/rfcs/0005-standard-signals.md
@@ -66,7 +66,7 @@ Conceptually, we want to run the reactive update lifecycle in an effect so that
 We can do this with an override of `performUpdate()` that wraps ReactiveElement's implementation in a watched computed signal:
 
 ```ts
-abstract class SignalWatcher extends Base {
+class SignalWatcher extends Base {
   // Watcher.watch() doesn't dedupe :(
   private __watching = false;
   private __watcher = new Signal.subtle.Watcher(() => {
@@ -101,6 +101,10 @@ abstract class SignalWatcher extends Base {
 }
 ```
 
+### effect(callback, options)
+
+An `effect` re-runs the provided callback any time signals accessed inside the callback are set. Effects run a microtask after any signals change. `effect` returns a dispose funcction which can be called to stop the effect from running. By providing `options`, an effect can be associated with an `element` and coordinated with its update cycle.
+
 ### watch() directive
 
 The `watch()` async directive accepts a signal and renders its value _asynchronously_ to the containing binding. When the signal changes, the binding value is updated directly.