diff --git a/trees/README.md b/trees/README.md
index 679aa4a..29fd54a 100644
--- a/trees/README.md
+++ b/trees/README.md
@@ -15,6 +15,18 @@
 
 <br>
 
+#### find height
+
+<br>
+
+```python
+def height(root):
+      if not root:
+            return -1
+      return 1 + max(height(root.left), height(root.right))
+````
+
+<br>
 
 ----