diff --git a/notes/3_building_docker_images.md b/notes/3_building_docker_images.md
index a6997ad..96f5fff 100644
--- a/notes/3_building_docker_images.md
+++ b/notes/3_building_docker_images.md
@@ -211,7 +211,7 @@ ENTRYPOINT echo google is this big; cat google-size
 
 ## Avoid golden images
 
-Golden images: legacy of previous developer that nobody dare to modify
+Golden images: A locally-modified image (like legacy of previous developer that nobody dare to modify)
 
 ### Preventing the Golden Image Problem