diff --git a/packages/effect-lens/README.md b/packages/effect-lens/README.md
index 22887dc..ce345eb 100644
--- a/packages/effect-lens/README.md
+++ b/packages/effect-lens/README.md
@@ -28,7 +28,7 @@ Lens<
     A,   // Type of the value the lens is focused on
     ER,  // Errors that can happen when reading
     EW,  // Errors that can happen when writing
-    RE,  // Requirements for reading
+    RR,  // Requirements for reading
     RW   // Requirements for writing
 >
 ```
@@ -55,11 +55,16 @@ yield* Lens.update(lens, Array.replace(1, 1664))
 Currently available:
 - `fromSubscriptionRef`
 - `fromSynchronizedRef` (note: since `SynchronizedRef` is not reactive (does not produce a stream of value changes), the resulting Lens' `changes` stream will only emit the current value of the lens when evaluated, and nothing else)
+- `fromRef` (returns an effect because it creates an internal lock)
 
 More to come!
 
 #### Manually
-You can also create Lenses manually using `make` by providing a getter, a stream of changes and either a `set` or `modify` function depending on your needs.
+You can also create Lenses manually using `make` by providing:
+- `get`: an effect that reads the current value,
+- `changes`: a stream of value changes,
+- `commit`: an effectful write primitive,
+- `lock`: an effect that produces the lock used to serialize writes.
 
 You can get pretty creative! Here's an example of a Lens that points to a specific key of the browser `LocalStorage`:
 ```typescript
@@ -83,9 +88,11 @@ const lens = Effect.all([
             Stream.unwrap,
         ),
 
-        set: a => Option.isSome(a)
+        commit: a => Option.isSome(a)
             ? kv.set(key, a.value)
             : kv.remove(key),
+
+        lock: Effect.succeed(effect => effect),
     })),
 
     Effect.provide(BrowserKeyValueStore.layerLocalStorage),