diff --git a/mailcow/README.adoc b/mailcow/README.adoc
index 1c6a0ec..003bd4f 100644
--- a/mailcow/README.adoc
+++ b/mailcow/README.adoc
@@ -50,14 +50,11 @@
 
 === Updating Mailcow
 
-Updating should usually be as easy as *synchronizing* the link:src/mailcow-dockerized/[] subtree with *upstream* and then <<Building the Docker image,rebuilding the image>>.
+Updating should usually be as easy as *synchronizing* the link:src/mailcow-dockerized/[] subrepo with *upstream* and then <<Building the Docker image,rebuilding the image>>.
 
-To synchronize the subtree, use `git subtree`:
+To synchronize the subrepo, use https://github.com/ingydotnet/git-subrepo[`git subrepo`]:
 
 [source,shell script]
 ----
-git subtree pull \
-    --prefix=mailcow/src/mailcow-dockerized \
-    https://github.com/mailcow/mailcow-dockerized.git \
-    master
+git subrepo pull mailcow/src/mailcow-dockerized
 ----