diff --git a/README.md b/README.md
index 01aa3064..7aff4bf4 100644
--- a/README.md
+++ b/README.md
@@ -27,6 +27,7 @@
 * Correct case for inherited and implemented method names.
 * Contravariance for parameter types and covariance for return types in inherited methods (also known as Liskov substitution principle - LSP)
 * Check LSP even for static methods
+* Check missing typehint in anonymous function when a native one could be added
 
 Additional rules are coming in subsequent releases!
 
diff --git a/rules.neon b/rules.neon
index 0d53b0cc..a26aae52 100644
--- a/rules.neon
+++ b/rules.neon
@@ -6,6 +6,7 @@ parameters:
 	checkAlwaysTrueStrictComparison: true
 	checkExplicitMixedMissingReturn: true
 	checkFunctionNameCase: true
+	checkMissingClosureNativeReturnTypehintRule: true
 	reportMaybesInMethodSignatures: true
 	reportStaticMethodSignatures: true
 
diff --git a/tests/Levels/data/foreach.php b/tests/Levels/data/foreach.php
index 5b83a3d5..a762fb6b 100644
--- a/tests/Levels/data/foreach.php
+++ b/tests/Levels/data/foreach.php
@@ -1,6 +1,6 @@
 <?php
 
-function () {
+function (): void {
 	foreach ([1, 2, 3] as $val) {
 		if (rand(0, 1) === 0) {
 			break;