diff --git a/tools/deploying-drutopia-updates.md b/tools/deploying-drutopia-updates.md
index b29bda0..5ff9916 100644
--- a/tools/deploying-drutopia-updates.md
+++ b/tools/deploying-drutopia-updates.md
@@ -24,3 +24,13 @@ sudo mv composer.phar /usr/local/bin/composer
 cd ~/Projects/drutopia-platform/drutopia_host/hosting_private
 ahoy git-pull-all
 ```
+
+## Bonus: Keep Drutopia builds with similar available modules
+
+To try to keep various Drutopia-based distributions from diverging too much, at least insofar as available modules, even if they aren't installed, we can use the **meld** (`sudo apt-get install meld`) diff tool to compare and share when posssible.
+
+```bash
+meld ~/Projects/agaric/sites/crla/crla-org/composer.json ~/Projects/agaric/sites/geo/composer.json ~/Projects/drutopia-platform/build_source/composer.json ~/Projects/agaric/sites/agaric-com/composer.json
+```
+
+When these align in not needing special patches or versions, we can consider dropping a custom build in favor of collaborating on a single one.