diff --git a/lib/binding_web/tree-sitter-web.d.ts b/lib/binding_web/tree-sitter-web.d.ts
index 2a0d2d1f..d90082c4 100644
--- a/lib/binding_web/tree-sitter-web.d.ts
+++ b/lib/binding_web/tree-sitter-web.d.ts
@@ -103,11 +103,13 @@ declare module 'web-tree-sitter' {
     export interface Tree {
       readonly rootNode: SyntaxNode;
 
+      copy(): Tree;
       delete(): void;
       edit(delta: Edit): Tree;
       walk(): TreeCursor;
       getChangedRanges(other: Tree): Range[];
       getEditedRange(other: Tree): Range;
+      getLanguage(): any;
     }
     namespace Language {
         function load(url: string): Promise<any>