diff --git a/lib/Promise.php b/lib/Promise.php
index bd6cea3..2928ce6 100644
--- a/lib/Promise.php
+++ b/lib/Promise.php
@@ -128,7 +128,7 @@ public function otherwise(callable $onRejected): Promise
     /**
      * Marks this promise as fulfilled and sets its return value.
      *
-     * @param mixed $value
+     * @param mixed $value the value to return for the fulfilled promise
      */
     public function fulfill($value = null): void
     {
@@ -168,8 +168,6 @@ public function reject(\Throwable $reason): void
      * one. In PHP it might be useful to call this on the last promise in a
      * chain.
      *
-     * @return mixed
-     *
      * @psalm-return TReturn
      */
     public function wait()
@@ -207,11 +205,11 @@ public function wait()
      * The result of the promise.
      *
      * If the promise was fulfilled, this will be the result value. If the
-     * promise was rejected, this property hold the rejection reason.
+     * promise was rejected, this property holds the rejection reason.
      *
-     * @var mixed
+     * @var mixed the result to be returned when the promise is resolved
      */
-    protected $value = null;
+    protected $value;
 
     /**
      * This method is used to call either an onFulfilled or onRejected callback.
diff --git a/lib/Promise/functions.php b/lib/Promise/functions.php
index d618303..4a40685 100644
--- a/lib/Promise/functions.php
+++ b/lib/Promise/functions.php
@@ -105,7 +105,7 @@ function ($reason) use ($fail, &$alreadyDone) {
  * If the value is a promise, the returned promise will attach itself to that
  * promise and eventually get the same state as the followed promise.
  *
- * @param mixed $value
+ * @param mixed $value the value to return when the promise is resolved
  *
  * @return Promise<mixed>
  */