diff --git a/config.sample.json b/config.sample.json
index a4110a15..b6ccda43 100644
--- a/config.sample.json
+++ b/config.sample.json
@@ -31,7 +31,8 @@
         "feature_custom_status": "labs",
         "feature_custom_tags": "labs",
         "feature_state_counters": "labs",
-        "feature_irc_ui": "labs"
+        "feature_irc_ui": "labs",
+        "feature_compact_modern_layout": "labs"
     },
     "default_federate": true,
     "default_theme": "light",
diff --git a/docs/labs.md b/docs/labs.md
index 6732ce07..41534f47 100644
--- a/docs/labs.md
+++ b/docs/labs.md
@@ -107,3 +107,7 @@ be missing critical features - please use at your own risk, though do report bug
 Adds an option to change the message layout to an IRC style ` timestamp | avatar
 | name | message `
 
+## Compact Group Layout (`feature_compact_modern_layout`)
+
+Adds the option to reduce space between messages in the Modern layout.
+
diff --git a/riot.im/develop/config.json b/riot.im/develop/config.json
index 167c2745..7e547227 100644
--- a/riot.im/develop/config.json
+++ b/riot.im/develop/config.json
@@ -25,7 +25,8 @@
         "feature_presence_in_room_list": "labs",
         "feature_custom_themes": "labs",
         "feature_new_room_list": "labs",
-        "feature_irc_ui": "labs"
+        "feature_irc_ui": "labs",
+        "feature_compact_modern_layout": "labs"
     },
     "piwik": {
         "url": "https://piwik.riot.im/",