diff --git a/signal_webhook/configuration.sample.py b/signal_webhook/configuration.sample.py
index 01d9494..86450aa 100644
--- a/signal_webhook/configuration.sample.py
+++ b/signal_webhook/configuration.sample.py
@@ -1,4 +1,5 @@
-# Signal 'address book'
+# Signal 'address book'. Refer to groups with `G:[base64_encoded_group_id]`, eg.
+# `G:UGVyZHUgIQo=`.
 RECIPIENTS = {"foo": ["+42..."]}  # FIXME
 
 # Recipient from the dict above to send to by default
diff --git a/signal_webhook/signal.py b/signal_webhook/signal.py
index d8c754e..e3466de 100644
--- a/signal_webhook/signal.py
+++ b/signal_webhook/signal.py
@@ -8,15 +8,18 @@ logger = logging.getLogger(__name__)
 
 
 def signal_send(recipients: list[str], message: str) -> None:
-    payload = {
-        "jsonrpc": "2.0",
-        "method": "send",
-        "params": {
-            "message": message,
-            "recipient": recipients,
-        },
-        "id": random.randint(0, (1 << 24)),
-    }
+    def to_dest(recipient: str) -> dict[str, str]:
+        if recipient.startswith("G:"):
+            return {"groupId": recipient[2:]}
+        return {"userId": recipient}
+
     with socket.socket(socket.AF_UNIX, socket.SOCK_STREAM) as signal_json:
         signal_json.connect(configuration.SIGNAL_SOCKET)
-        signal_json.send(json.dumps(payload).encode("utf-8"))
+        for recipient in recipients:
+            payload = {
+                "jsonrpc": "2.0",
+                "method": "send",
+                "params": {"message": message, **to_dest(recipient)},
+                "id": random.randint(0, (1 << 24)),
+            }
+            signal_json.send(json.dumps(payload).encode("utf-8"))