diff --git a/packages/reffuse/src/ReffuseContext.tsx b/packages/reffuse/src/ReffuseContext.tsx
index 0115a47..d2236af 100644
--- a/packages/reffuse/src/ReffuseContext.tsx
+++ b/packages/reffuse/src/ReffuseContext.tsx
@@ -58,8 +58,7 @@ export function useMergeAll<T extends Array<unknown>>(
     return React.useMemo(() => Context.mergeAll(...values), values)
 }
 
-/** TODO: find a way to make 'contexts' a NonEmptyArray */
-export function useMergeAllLayers<T extends Array<unknown>>(
+export function useMergeAllLayers<T extends Array.NonEmptyArray<unknown>>(
     ...contexts: [...{ [K in keyof T]: ReffuseContext<T[K]> }]
 ): Layer.Layer<T[number]> {
     const values = Array.map(
@@ -71,7 +70,3 @@ export function useMergeAllLayers<T extends Array<unknown>>(
         ...Array.map(values, context => Layer.effectContext(Effect.succeed(context)))
     ), values)
 }
-
-// declare const context1: ReffuseContext<never>
-// declare const context2: ReffuseContext<"prout">
-// const res = useMergeAllLayers(context1, context2)