Document how to run Synapse (#15022)

* Document how to run Synapse

* Changelog for 15022

* Update docs/development/contributing_guide.md

1 files changed, 13 insertions, 0 deletions

diff --git a/docs/development/contributing_guide.md b/docs/development/contributing_guide.md
index 36bc884684..925dcd8933 100644
--- a/docs/development/contributing_guide.md
+++ b/docs/development/contributing_guide.md
@@ -78,6 +78,19 @@ poetry install --extras all
 
 This will install the runtime and developer dependencies for the project.
 
+## Running Synapse via poetry
+
+To start a local instance of Synapse in the locked poetry environment, create a config file:
+
+```sh
+cp docs/sample_config.yaml homeserver.yaml
+```
+
+Now edit homeserver.yaml, and run Synapse with:
+
+```sh
+poetry run python -m synapse.app.homeserver -c homeserver.yaml
+```
 
 # 5. Get in touch.