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diff --git a/docker/demo/README b/docker/demo/README
index fe0f770..9d0e7ac 100644
--- a/docker/demo/README
+++ b/docker/demo/README
@@ -58,6 +58,20 @@ modified image. Tag it, to let other images use it to build:
Now build all the images with docker-compose, as described
in the 'How to run' section.
+How to run only one image
+=========================
+
+The following commands run only one image, from those
+belonging to the compose file. Note that such image may
+easily fail because it likely relies on other images not
+being run.
+
+$ docker-compose build $image-name # if also new changes need to be tested.
+$ docker-compose up $image-name
+
+'bank', 'exchange', 'merchant', 'talerdb' are valid values
+for $image-name.
+
How to run
==========