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diff --git a/docs/en/developers/03_Running_tests.md b/docs/en/developers/03_Running_tests.md
index 197a01057..be2414d80 100644
--- a/docs/en/developers/03_Running_tests.md
+++ b/docs/en/developers/03_Running_tests.md
@@ -34,3 +34,43 @@ They are performed with [GitHub Actions](https://github.com/FreshRSS/FreshRSS/ac
 This ensures your code will not introduce some kind of regression. We will not merge a PR if tests fail so we will ask you to fix any bugs before reviewing your code.
 
 If you are interested, you can take a look at [the configuration file](https://github.com/FreshRSS/FreshRSS/blob/edge/.github/workflows/tests.yml).
+
+## Using feed snapshots
+
+As feed data is volatile, it’s better to work with snapshots when debugging some issues.
+You can find the description to retrieve a snapshot [here](06_Reporting_Bugs.md#how-to-provide-feed-data).
+
+To serve those snapshots, you can use a mock server.
+Here we will demonstrate how to work with [WireMock](https://wiremock.org/) but other solutions exist.
+Here are the steps to start using the WireMock mock server:
+
+1. Go to the mock server home folder.
+If you do not have one, you need to create one.
+1. Inside the mock server home folder, create the ___file_ and _mappings_ folders.
+1. Copy or move your snapshots in the ___file_ folder.
+1. Create the _feed.json_ file in the _mappings_ folder with the following content:
+	```js
+	{
+		"request": {
+			"method": "GET",
+			"urlPathPattern": "/.*"
+		},
+		"response": {
+			"status": 200,
+			"bodyFileName": "{{request.pathSegments.[0]}}",
+			"transformers": ["response-template"],
+			"headers": {
+				"Content-Type": "application/rss+xml"
+			}
+		}
+	}
+	```
+1. Launch the containerized server with the following command:
+	```bash
+	# <PORT> is the port used on the host to communicate with the server
+	# <NETWORK> is the name of the docker network used (by default, it’s freshrss-network)
+	docker run -it --rm -p <PORT>:8080 --name wiremock --network <NETWORK> -v $PWD:/home/wiremock wiremock/wiremock:latest-alpine --local-response-templating
+	```
+1. You can access the `<RSS>` mock file directly:
+   * from the host by sending a GET request to `http://localhost:<PORT>/<RSS>`,
+   * from any container connected on the same network by sending a GET request to `http://wiremock:8080/<RSS>`.