diff --git a/requirements.txt b/requirements.txt
index 0f8c8c86d..27cf8e218 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -30,5 +30,6 @@ gpiozero
 
 # Code quality
 flake8>=4.0.0
+flake8-docstrings
 pytest
 mock