diff --git a/apps.json b/apps.json
index 7ea99fd5..81528a49 100644
--- a/apps.json
+++ b/apps.json
@@ -1319,6 +1319,14 @@
         "state": "working",
         "url": "https://github.com/yunohost-apps/humhub_ynh"
     },
+    "hydrogen": {
+        "category": "communication",
+        "state": "working",
+        "subtags": [
+            "chat"
+        ],
+        "url": "https://github.com/YunoHost-Apps/hydrogen_ynh"
+    },
     "icecoder": {
         "category": "dev",
         "level": 0,