diff --git a/monitor/bt.h b/monitor/bt.h
index d7fd796..434653e 100644
--- a/monitor/bt.h
+++ b/monitor/bt.h
@@ -1835,6 +1835,31 @@ struct bt_hci_rsp_le_test_end {
 	uint16_t num_packets;
 } __attribute__ ((packed));
 
+#define BT_HCI_CMD_LE_CONN_PARAM_REQ_REPLY	0x2020
+struct bt_hci_cmd_le_conn_param_req_reply {
+	uint16_t handle;
+	uint16_t min_interval;
+	uint16_t max_interval;
+	uint16_t latency;
+	uint16_t supv_timeout;
+	uint16_t min_length;
+	uint16_t max_length;
+} __attribute__ ((packed));
+struct bt_hci_rsp_le_conn_param_req_reply {
+	uint8_t  status;
+	uint16_t handle;
+} __attribute__ ((packed));
+
+#define BT_HCI_CMD_LE_CONN_PARAM_REQ_NEG_REPLY	0x2021
+struct bt_hci_cmd_le_conn_param_req_neg_reply {
+	uint16_t handle;
+	uint8_t  reason;
+} __attribute__ ((packed));
+struct bt_hci_rsp_le_conn_param_req_neg_reply {
+	uint8_t  status;
+	uint16_t handle;
+} __attribute__ ((packed));
+
 #define BT_HCI_EVT_INQUIRY_COMPLETE		0x01
 struct bt_hci_evt_inquiry_complete {
 	uint8_t  status;
diff --git a/monitor/packet.c b/monitor/packet.c
index 8cfd3c8..a4f3f8b 100644
--- a/monitor/packet.c
+++ b/monitor/packet.c
@@ -5888,6 +5888,45 @@ static void le_test_end_rsp(const void *data, uint8_t size)
 	print_field("Number of packets: %d", le16_to_cpu(rsp->num_packets));
 }
 
+static void le_conn_param_req_reply_cmd(const void *data, uint8_t size)
+{
+	const struct bt_hci_cmd_le_conn_param_req_reply *cmd = data;
+
+	print_handle(cmd->handle);
+	print_slot_125("Min connection interval", cmd->min_interval);
+	print_slot_125("Max connection interval", cmd->max_interval);
+	print_field("Connection latency: 0x%4.4x", le16_to_cpu(cmd->latency));
+	print_field("Supervision timeout: %d msec (0x%4.4x)",
+					le16_to_cpu(cmd->supv_timeout) * 10,
+					le16_to_cpu(cmd->supv_timeout));
+	print_slot_625("Min connection length", cmd->min_length);
+	print_slot_625("Max connection length", cmd->max_length);
+}
+
+static void le_conn_param_req_reply_rsp(const void *data, uint8_t size)
+{
+	const struct bt_hci_rsp_le_conn_param_req_reply *rsp = data;
+
+	print_status(rsp->status);
+	print_handle(rsp->handle);
+}
+
+static void le_conn_param_req_neg_reply_cmd(const void *data, uint8_t size)
+{
+	const struct bt_hci_cmd_le_conn_param_req_neg_reply *cmd = data;
+
+	print_handle(cmd->handle);
+	print_reason(cmd->reason);
+}
+
+static void le_conn_param_req_neg_reply_rsp(const void *data, uint8_t size)
+{
+	const struct bt_hci_rsp_le_conn_param_req_neg_reply *rsp = data;
+
+	print_status(rsp->status);
+	print_handle(rsp->handle);
+}
+
 struct opcode_data {
 	uint16_t opcode;
 	int bit;
@@ -6515,8 +6554,12 @@ static const struct opcode_data opcode_table[] = {
 	{ 0x201f, 230, "LE Test End",
 				null_cmd, 0, true,
 				le_test_end_rsp, 3, true },
-	{ 0x2020, 268, "LE Remote Connection Parameter Request Reply" },
-	{ 0x2021, 269, "LE Remote Connection Parameter Request Negative Reply" },
+	{ 0x2020, 268, "LE Remote Connection Parameter Request Reply",
+				le_conn_param_req_reply_cmd, 14, true,
+				le_conn_param_req_reply_rsp, 3, true },
+	{ 0x2021, 269, "LE Remote Connection Parameter Request Negative Reply",
+				le_conn_param_req_neg_reply_cmd, 3, true,
+				le_conn_param_req_neg_reply_rsp, 3, true },
 	{ }
 };