diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 325de2be5..7ad21312a 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -40,6 +40,10 @@ ElementX uses Fastlane for running actions on the CI and tries to keep the confi
 
 Please run `bundle exec fastlane` to see available options.
 
+### Network debugging proxy
+
+It's possible to debug the app's network traffic with a proxy server by setting the `HTTPS_PROXY` environment variable in the ElementX scheme to the proxy's address (e.g. localhost:8080 for mitmproxy).
+
 ## Pull requests
 
 Please see our [pull request guide](https://github.com/vector-im/element-android/blob/develop/docs/pull_request.md).
diff --git a/changelog.d/223.doc b/changelog.d/223.doc
new file mode 100644
index 000000000..33465ee13
--- /dev/null
+++ b/changelog.d/223.doc
@@ -0,0 +1 @@
+Add notes for how to debug the network traffic