diff --git a/README.md b/README.md
index a1cc75e..817f8c6 100644
--- a/README.md
+++ b/README.md
@@ -237,7 +237,7 @@ resolveType | `callback($value, $context, ResolveInfo $info) => objectType` | An
 
 **Notes**:
 
-1. If `resolveType` option is omitted, GraphQL PHP will loop through all interface implementors and use their `isTypeOf()` method to pick the first suitable one. This is obviously less efficient than single `resolveType` call. So it is recommended to define `resolveType` when possible.
+1. If `resolveType` option is omitted, GraphQL PHP will loop through all interface implementers and use their `isTypeOf()` method to pick the first suitable one. This is obviously less efficient than single `resolveType` call. So it is recommended to define `resolveType` when possible.
 
 2. Interface types do not participate in data fetching. They just resolve actual `object` type which will be asked for data when GraphQL query is executed.
 
diff --git a/src/Executor/Promise/Adapter/SyncPromiseAdapter.php b/src/Executor/Promise/Adapter/SyncPromiseAdapter.php
index 38be0df..e0791bc 100644
--- a/src/Executor/Promise/Adapter/SyncPromiseAdapter.php
+++ b/src/Executor/Promise/Adapter/SyncPromiseAdapter.php
@@ -128,6 +128,7 @@ class SyncPromiseAdapter implements PromiseAdapter
      */
     public function wait(Promise $promise)
     {
+        $this->beforeWait($promise);
         $dfdQueue = Deferred::getQueue();
         $promiseQueue = SyncPromise::getQueue();
 
@@ -137,6 +138,7 @@ class SyncPromiseAdapter implements PromiseAdapter
         ) {
             Deferred::runQueue();
             SyncPromise::runQueue();
+            $this->onWait($promise);
         }
 
         /** @var SyncPromise $syncPromise */
@@ -150,4 +152,22 @@ class SyncPromiseAdapter implements PromiseAdapter
 
         throw new InvariantViolation("Could not resolve promise");
     }
+
+    /**
+     * Execute just before starting to run promise completion
+     *
+     * @param Promise $promise
+     */
+    protected function beforeWait(Promise $promise)
+    {
+    }
+
+    /**
+     * Execute while running promise completion
+     *
+     * @param Promise $promise
+     */
+    protected function onWait(Promise $promise)
+    {
+    }
 }