potiuk commented on a change in pull request #21052:
URL: https://github.com/apache/airflow/pull/21052#discussion_r790344659



##########
File path: docs/docker-stack/build.rst
##########
@@ -81,7 +81,9 @@ In the simplest case building your image consists of those 
steps:
 
 4) Once you build the image locally you have usually several options to make 
them available for your deployment:
 
-* For ``docker-compose`` deployment, that's all you need. The image is stored 
in Docker engine cache
+* For ``docker-compose`` deployment, open your ``docker-compose.yaml`` file 
and search for the phrase "In order 
+  to add custom dependencies". Follow these instructions of commenting the 
"image" line and uncommenting the 
+  "build" line. Then run `docker-compose build` to build the images. The image 
is stored in Docker engine cache
   and Docker Compose will use it from there.

Review comment:
       This would be a much more accurate description. There are several ways 
you can build an use image for docker-compose and they have pros and cons. 




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