diff --git a/src/Cache/ClientCache.php b/src/Cache/ClientCache.php
index bc91b97..e92a3d5 100644
--- a/src/Cache/ClientCache.php
+++ b/src/Cache/ClientCache.php
@@ -11,6 +11,11 @@ use Sabre\Event\Promise;
  */
 class ClientCache implements Cache
 {
+    /**
+     * @var LanguageClient
+     */
+    public $client;
+
     /**
      * @param LanguageClient $client
      */
diff --git a/src/Client/TextDocument.php b/src/Client/TextDocument.php
index 7630438..03211fa 100644
--- a/src/Client/TextDocument.php
+++ b/src/Client/TextDocument.php
@@ -4,7 +4,7 @@ declare(strict_types = 1);
 namespace LanguageServer\Client;
 
 use LanguageServer\ClientHandler;
-use LanguageServerProtocol\{TextDocumentItem, TextDocumentIdentifier};
+use LanguageServerProtocol\{Diagnostic, TextDocumentItem, TextDocumentIdentifier};
 use Sabre\Event\Promise;
 use JsonMapper;
 
diff --git a/src/Definition.php b/src/Definition.php
index 42329fe..7742546 100644
--- a/src/Definition.php
+++ b/src/Definition.php
@@ -4,7 +4,7 @@ declare(strict_types = 1);
 namespace LanguageServer;
 
 use LanguageServer\Index\ReadableIndex;
-use phpDocumentor\Reflection\{Types, Type, Fqsen, TypeResolver};
+use phpDocumentor\Reflection\{Types, Type, TypeResolver};
 use LanguageServerProtocol\SymbolInformation;
 use Generator;
 
@@ -80,7 +80,7 @@ class Definition
      * Can also be a compound type.
      * If it is unknown, will be Types\Mixed_.
      *
-     * @var \phpDocumentor\Type|null
+     * @var Type|null
      */
     public $type;
 
diff --git a/src/Index/Index.php b/src/Index/Index.php
index 0c8e3e9..0d61f9c 100644
--- a/src/Index/Index.php
+++ b/src/Index/Index.php
@@ -274,7 +274,6 @@ class Index implements ReadableIndex, \Serializable
     }
 
     /**
-     * @param string $serialized
      * @return string
      */
     public function serialize()
diff --git a/src/LanguageServer.php b/src/LanguageServer.php
index a30992b..38dfeb1 100644
--- a/src/LanguageServer.php
+++ b/src/LanguageServer.php
@@ -167,7 +167,7 @@ class LanguageServer extends AdvancedJsonRpc\Dispatcher
      */
     public function initialize(ClientCapabilities $capabilities, string $rootPath = null, int $processId = null, string $rootUri = null): Promise
     {
-        if ($rootPath === null) {
+        if ($rootPath === null && $rootUri !== null) {
             $rootPath = uriToPath($rootUri);
         }
         return coroutine(function () use ($capabilities, $rootPath, $processId) {
diff --git a/src/PhpDocument.php b/src/PhpDocument.php
index 0547615..d148f9c 100644
--- a/src/PhpDocument.php
+++ b/src/PhpDocument.php
@@ -63,7 +63,7 @@ class PhpDocument
     /**
      * Map from fully qualified name (FQN) to Node
      *
-     * @var Node
+     * @var Node[]
      */
     private $definitionNodes;
 
diff --git a/src/SignatureHelpProvider.php b/src/SignatureHelpProvider.php
index 43851b0..66afd5f 100644
--- a/src/SignatureHelpProvider.php
+++ b/src/SignatureHelpProvider.php
@@ -6,8 +6,7 @@ namespace LanguageServer;
 use LanguageServer\Index\ReadableIndex;
 use LanguageServerProtocol\{
     Position,
-    SignatureHelp,
-    ParameterInformation
+    SignatureHelp
 };
 use Microsoft\PhpParser\Node;
 use Sabre\Event\Promise;