diff --git a/src/Illuminate/Contracts/Routing/UrlRoutable.php b/src/Illuminate/Contracts/Routing/UrlRoutable.php
index 55ad25f9d5de..d1dd94cc700a 100644
--- a/src/Illuminate/Contracts/Routing/UrlRoutable.php
+++ b/src/Illuminate/Contracts/Routing/UrlRoutable.php
@@ -19,10 +19,10 @@ public function getRouteKey();
     public function getRouteKeyName();
 
     /**
-     * Retrieve model for route model binding.
+     * Retrieve the model for a bound value.
      *
-     * @param  mixed  $routeKey
-     * @return null|\Illuminate\Database\Eloquent\Model
+     * @param  mixed  $value
+     * @return \Illuminate\Database\Eloquent\Model|null
      */
-    public function resolveRouteBinding($routeKey);
+    public function resolveRouteBinding($value);
 }
diff --git a/src/Illuminate/Database/Eloquent/Model.php b/src/Illuminate/Database/Eloquent/Model.php
index f456dce7c633..b683c04e34d8 100644
--- a/src/Illuminate/Database/Eloquent/Model.php
+++ b/src/Illuminate/Database/Eloquent/Model.php
@@ -1252,10 +1252,10 @@ public function getRouteKeyName()
     }
 
     /**
-     * Retrieve model for route model binding.
+     * Retrieve the model for a bound value.
      *
-     * @param  mixed  $routeKey
-     * @return null|\Illuminate\Database\Eloquent\Model
+     * @param  mixed  $value
+     * @return \Illuminate\Database\Eloquent\Model|null
      */
     public function resolveRouteBinding($routeKey)
     {