diff --git a/profiles/audio/avctp.c b/profiles/audio/avctp.c
index 9f717f3..702ded1 100644
--- a/profiles/audio/avctp.c
+++ b/profiles/audio/avctp.c
@@ -1614,7 +1614,7 @@ static void avctp_confirm_cb(GIOChannel *chan, gpointer data)
 	return;
 }
 
-static GIOChannel *avctp_server_socket(const bdaddr_t *src, gboolean master,
+static GIOChannel *avctp_server_socket(const bdaddr_t *src, gboolean central,
 						uint8_t mode, uint16_t psm)
 {
 	GError *err = NULL;
@@ -1625,7 +1625,7 @@ static GIOChannel *avctp_server_socket(const bdaddr_t *src, gboolean master,
 				BT_IO_OPT_SOURCE_BDADDR, src,
 				BT_IO_OPT_PSM, psm,
 				BT_IO_OPT_SEC_LEVEL, BT_IO_SEC_MEDIUM,
-				BT_IO_OPT_CENTRAL, master,
+				BT_IO_OPT_CENTRAL, central,
 				BT_IO_OPT_MODE, mode,
 				BT_IO_OPT_INVALID);
 	if (!io) {
@@ -1636,20 +1636,20 @@ static GIOChannel *avctp_server_socket(const bdaddr_t *src, gboolean master,
 	return io;
 }
 
-int avctp_register(struct btd_adapter *adapter, gboolean master)
+int avctp_register(struct btd_adapter *adapter, gboolean central)
 {
 	struct avctp_server *server;
 	const bdaddr_t *src = btd_adapter_get_address(adapter);
 
 	server = g_new0(struct avctp_server, 1);
 
-	server->control_io = avctp_server_socket(src, master, BT_IO_MODE_BASIC,
+	server->control_io = avctp_server_socket(src, central, BT_IO_MODE_BASIC,
 							AVCTP_CONTROL_PSM);
 	if (!server->control_io) {
 		g_free(server);
 		return -1;
 	}
-	server->browsing_io = avctp_server_socket(src, master, BT_IO_MODE_ERTM,
+	server->browsing_io = avctp_server_socket(src, central, BT_IO_MODE_ERTM,
 							AVCTP_BROWSING_PSM);
 	if (!server->browsing_io) {
 		if (server->control_io) {
diff --git a/profiles/audio/avctp.h b/profiles/audio/avctp.h
index 23e3732..ca5ff91 100644
--- a/profiles/audio/avctp.h
+++ b/profiles/audio/avctp.h
@@ -145,7 +145,7 @@ unsigned int avctp_add_state_cb(struct btd_device *dev, avctp_state_cb cb,
 							void *user_data);
 gboolean avctp_remove_state_cb(unsigned int id);
 
-int avctp_register(struct btd_adapter *adapter, gboolean master);
+int avctp_register(struct btd_adapter *adapter, gboolean central);
 void avctp_unregister(struct btd_adapter *adapter);
 
 struct avctp *avctp_connect(struct btd_device *device);
diff --git a/profiles/health/mcap.c b/profiles/health/mcap.c
index be13af3..5161ef7 100644
--- a/profiles/health/mcap.c
+++ b/profiles/health/mcap.c
@@ -52,15 +52,15 @@
 struct mcap_csp {
 	uint64_t	base_tmstamp;	/* CSP base timestamp */
 	struct timespec	base_time;	/* CSP base time when timestamp set */
-	guint		local_caps;	/* CSP-Master: have got remote caps */
-	guint		remote_caps;	/* CSP-Slave: remote master got caps */
-	guint		rem_req_acc;	/* CSP-Slave: accuracy required by master */
-	guint		ind_expected;	/* CSP-Master: indication expected */
-	uint8_t		csp_req;	/* CSP-Master: Request control flag */
-	guint		ind_timer;	/* CSP-Slave: indication timer */
-	guint		set_timer;	/* CSP-Slave: delayed set timer */
-	void		*set_data;	/* CSP-Slave: delayed set data */
-	void		*csp_priv_data;	/* CSP-Master: In-flight request data */
+	guint		local_caps;	/* CSP-Cent.: have got remote caps */
+	guint		remote_caps;	/* CSP-Perip: remote central got caps */
+	guint		rem_req_acc;	/* CSP-Perip: accuracy req by central */
+	guint		ind_expected;	/* CSP-Cent.: indication expected */
+	uint8_t		csp_req;	/* CSP-Cent.: Request control flag */
+	guint		ind_timer;	/* CSP-Perip: indication timer */
+	guint		set_timer;	/* CSP-Perip: delayed set timer */
+	void		*set_data;	/* CSP-Perip: delayed set data */
+	void		*csp_priv_data;	/* CSP-Cent.: In-flight request data */
 };
 
 struct mcap_sync_cap_cbdata {
@@ -3139,7 +3139,7 @@ void mcap_sync_set_req(struct mcap_mcl *mcl, uint8_t update, uint32_t btclock,
 		g_set_error(err,
 			MCAP_CSP_ERROR,
 			MCAP_ERROR_RESOURCE_UNAVAILABLE,
-			"Did not get CSP caps from slave yet");
+			"Did not get CSP caps from peripheral yet");
 		return;
 	}
 
diff --git a/profiles/health/mcap.h b/profiles/health/mcap.h
index 5a94c8b..00f3fa8 100644
--- a/profiles/health/mcap.h
+++ b/profiles/health/mcap.h
@@ -270,7 +270,7 @@ struct mcap_instance {
 	mcap_mcl_event_cb	mcl_reconnected_cb;	/* Old MCL has been reconnected */
 	mcap_mcl_event_cb	mcl_disconnected_cb;	/* MCL disconnected */
 	mcap_mcl_event_cb	mcl_uncached_cb;	/* MCL has been removed from MCAP cache */
-	mcap_info_ind_event_cb	mcl_sync_infoind_cb;	/* (CSP Master) Received info indication */
+	mcap_info_ind_event_cb	mcl_sync_infoind_cb;	/* (CSP Central) Received info indication */
 	gpointer		user_data;		/* Data to be provided in callbacks */
 	int			ref;			/* Reference counter */