diff --git a/proposals/3020-private-federations.md b/proposals/3020-private-federations.md
index 3ef4d704..b5acc60a 100644
--- a/proposals/3020-private-federations.md
+++ b/proposals/3020-private-federations.md
@@ -30,7 +30,7 @@ For example, to indicate that a given server is able to participate in the
 [Tchap](https://www.numerique.gouv.fr/outils-agents/tchap-messagerie-instantanee-etat/) network
 and a hypothetical NATO network (but not the public internet), the capability would be:
 
-```json
+```json5
 'm.networks': [
     "fr.gouv.tchap",
     "int.nato"