diff --git a/tools/public_api_guard/cdk/tree.md b/tools/public_api_guard/cdk/tree.md
index bbb95d5da184..67fa0268f238 100644
--- a/tools/public_api_guard/cdk/tree.md
+++ b/tools/public_api_guard/cdk/tree.md
@@ -125,7 +125,7 @@ export class CdkTreeNode<T, K = T> implements FocusableOption, OnDestroy, OnInit
     protected _elementRef: ElementRef<HTMLElement>;
     focus(): void;
     // (undocumented)
-    get isExpanded(): boolean;
+    get isLeafNode(): boolean | null;
     // (undocumented)
     get level(): number;
     static mostRecentTreeNode: CdkTreeNode<any> | null;