diff --git a/doc/PLUGINS.md b/doc/PLUGINS.md
index 6f81c4410..db4515a21 100644
--- a/doc/PLUGINS.md
+++ b/doc/PLUGINS.md
@@ -1034,6 +1034,7 @@ the v2 protocol, and it has passed basic sanity checks:
     "max_accepted_htlcs": 483,
     "channel_flags": 1
     "locktime": 2453,
+    "channel_max_msat": "16777215000msat"
   }
 }
 ```
diff --git a/lightningd/dual_open_control.c b/lightningd/dual_open_control.c
index 44a550881..f6868881b 100644
--- a/lightningd/dual_open_control.c
+++ b/lightningd/dual_open_control.c
@@ -241,6 +241,9 @@ struct openchannel2_payload {
 	u8 channel_flags;
 	u32 locktime;
 	u8 *shutdown_scriptpubkey;
+	/* What's the maximum amount of funding
+	 * this channel can hold */
+	struct amount_sat channel_max;
 
 	struct amount_sat accepter_funding;
 	struct wally_psbt *psbt;
@@ -278,6 +281,8 @@ openchannel2_hook_serialize(struct openchannel2_payload *payload,
 	if (tal_bytelen(payload->shutdown_scriptpubkey) != 0)
 		json_add_hex_talarr(stream, "shutdown_scriptpubkey",
 				    payload->shutdown_scriptpubkey);
+	json_add_amount_sat_only(stream, "channel_max_msat",
+				 payload->channel_max);
 	json_object_end(stream);
 }
 
@@ -1695,6 +1700,12 @@ static void accepter_got_offer(struct subd *dualopend,
 	payload->feerate_our_min = feerate_min(dualopend->ld, NULL);
 	payload->feerate_our_max = feerate_max(dualopend->ld, NULL);
 
+	payload->channel_max = chainparams->max_funding;
+	if (feature_negotiated(dualopend->ld->our_features,
+			       channel->peer->their_features,
+			       OPT_LARGE_CHANNELS))
+		payload->channel_max = AMOUNT_SAT(UINT64_MAX);
+
 	tal_add_destructor2(dualopend, openchannel2_remove_dualopend, payload);
 	plugin_hook_call_openchannel2(dualopend->ld, payload);
 }
diff --git a/tests/test_plugin.py b/tests/test_plugin.py
index e4e944b68..6ea840e9d 100644
--- a/tests/test_plugin.py
+++ b/tests/test_plugin.py
@@ -606,6 +606,7 @@ def test_openchannel_hook(node_factory, bitcoind):
             'feerate_our_min': '1875',
             'locktime': '.*',
             'their_funding': '100000000msat',
+            'channel_max_msat': '16777215000msat',
         })
     else:
         expected.update({