diff --git a/README.md b/README.md
index 44473db..3041d9c 100644
--- a/README.md
+++ b/README.md
@@ -219,6 +219,9 @@ cd stagehand-python
 
 # Install in editable mode with development dependencies
 pip install -r requirements.txt
+
+# Ensure that a Chromium binary exists for local testing
+python -m playwright install chromium
 ```