diff --git a/README.md b/README.md
index b2ec922..35853bf 100644
--- a/README.md
+++ b/README.md
@@ -6,3 +6,5 @@
 [![License](https://img.shields.io/packagist/l/felixfbecker/language-server.svg)](https://github.com/felixfbecker/php-language-server/blob/master/LICENSE.txt)
 
 A pure PHP implementation of the [Language Server Protocol](https://github.com/Microsoft/language-server-protocol).
+
+![Find all symbols demo](images/documentSymbol.gif)
diff --git a/images/documentSymbol.gif b/images/documentSymbol.gif
new file mode 100644
index 0000000..43a468a
Binary files /dev/null and b/images/documentSymbol.gif differ
diff --git a/src/SymbolFinder.php b/src/SymbolFinder.php
index 604e3cf..0d0b90e 100644
--- a/src/SymbolFinder.php
+++ b/src/SymbolFinder.php
@@ -4,6 +4,7 @@ declare(strict_types = 1);
 namespace LanguageServer;
 
 use PhpParser\{NodeVisitorAbstract, Node};
+use LanguageServer\Protocol\{SymbolInformation, SymbolKind, Range, Position, Location};
 
 class SymbolFinder extends NodeVisitorAbstract
 {
@@ -41,17 +42,17 @@ class SymbolFinder extends NodeVisitorAbstract
     public function enterNode(Node $node)
     {
         $class = get_class($node);
-        if (!isset(self::NODE_SYMBOL_MAP[$class])) {
+        if (!isset(self::NODE_SYMBOL_KIND_MAP[$class])) {
             return;
         }
         $symbol = new SymbolInformation();
-        $symbol->kind = self::NODE_SYMBOL_MAP[$class];
+        $symbol->kind = self::NODE_SYMBOL_KIND_MAP[$class];
         $symbol->name = (string)$node->name;
         $symbol->location = new Location(
             $this->uri,
             new Range(
-                new Position($node->getAttribute('startLine'), $node->getAttribute('startColumn')),
-                new Position($node->getAttribute('endLine'), $node->getAttribute('endColumn'))
+                new Position($node->getAttribute('startLine') - 1, $node->getAttribute('startColumn') - 1),
+                new Position($node->getAttribute('endLine') - 1, $node->getAttribute('endColumn') - 1)
             )
         );
         $symbol->containerName = $this->containerName;
diff --git a/src/TextDocumentManager.php b/src/TextDocumentManager.php
index b7a09f8..f0825ff 100644
--- a/src/TextDocumentManager.php
+++ b/src/TextDocumentManager.php
@@ -4,7 +4,7 @@ namespace LanguageServer;
 
 use PhpParser\{Error, Comment, Node, ParserFactory, NodeTraverser, Lexer};
 use PhpParser\NodeVisitor\NameResolver;
-use LanguageServer\Protocol\TextDocumentItem;
+use LanguageServer\Protocol\{TextDocumentItem, TextDocumentIdentifier, VersionedTextDocumentIdentifier};
 
 /**
  * Provides method handlers for all textDocument/* methods
@@ -65,18 +65,18 @@ class TextDocumentManager
     /**
      * The document change notification is sent from the client to the server to signal changes to a text document.
      *
-     * @param LanguageServer\Protocol\VersionedTextDocumentIdentifier $textDocument
-     * @param LanguageServer\Protocol\TextDocumentContentChangeEvent[] $contentChanges
+     * @param Protocol\VersionedTextDocumentIdentifier $textDocument
+     * @param Protocol\TextDocumentContentChangeEvent[] $contentChanges
      * @return void
      */
     public function didChange(VersionedTextDocumentIdentifier $textDocument, array $contentChanges)
     {
-        $this->updateAst($textDocument->uri, $contentChanges->text);
+        $this->updateAst($textDocument->uri, $contentChanges[0]->text);
     }
 
     private function updateAst(string $uri, string $content)
     {
-        $stmts = $parser->parse($content);
+        $stmts = $this->parser->parse($content);
         // TODO report errors as diagnostics
         // foreach ($parser->getErrors() as $error) {
         //     error_log($error->getMessage());
@@ -85,7 +85,7 @@ class TextDocumentManager
         if ($stmts) {
             $traverser = new NodeTraverser;
             $traverser->addVisitor(new NameResolver);
-            $traverser->addVisitor(new ColumnCalculator($textDocument->text));
+            $traverser->addVisitor(new ColumnCalculator($content));
             $traverser->traverse($stmts);
         }
         $this->asts[$uri] = $stmts;