diff --git a/CHANGELOG.md b/CHANGELOG.md
index 547c3e7f9..c8538f088 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -18,6 +18,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ### Added
 GATT Client: allow to register for any notification/indication and/or any connection
+hci_cmd: added hci_read_inquiry_scan_activity and hci_write_inquiry_scan_activity
 
 ### Changed
 - AVRCP Target: volume in avrcp_target_volume_changed is reported as current value in interim response to register for volume change notifications
diff --git a/src/hci_cmd.c b/src/hci_cmd.c
index f2864c475..a0a69f41b 100644
--- a/src/hci_cmd.c
+++ b/src/hci_cmd.c
@@ -645,6 +645,13 @@ const hci_cmd_t hci_write_page_timeout = {
 OPCODE(OGF_CONTROLLER_BASEBAND, 0x18), "2"
 };
 
+/**
+ * @param scan_enable (no, inq, page, inq+page)
+ */
+const hci_cmd_t hci_write_scan_enable = {
+OPCODE(OGF_CONTROLLER_BASEBAND, 0x1A), "1"
+};
+
 /**
  */ 
 const hci_cmd_t hci_read_page_scan_activity = {
@@ -660,10 +667,17 @@ OPCODE(OGF_CONTROLLER_BASEBAND, 0x1C), "22"
 };
 
 /**
- * @param scan_enable (no, inq, page, inq+page)
- */
-const hci_cmd_t hci_write_scan_enable = {
-OPCODE(OGF_CONTROLLER_BASEBAND, 0x1A), "1"
+ */ 
+const hci_cmd_t hci_read_inquiry_scan_activity = {
+OPCODE(OGF_CONTROLLER_BASEBAND, 0x1D), ""
+};
+
+/**
+ * @param inquiry_scan_interval (* 0.625 ms)
+ * @param inquiry_scan_window (* 0.625 ms, must be <= inquiry_scan_interval)
+ */ 
+const hci_cmd_t hci_write_inquiry_scan_activity = {
+OPCODE(OGF_CONTROLLER_BASEBAND, 0x1E), "22"
 };
 
 /**
diff --git a/src/hci_cmd.h b/src/hci_cmd.h
index 1684cd1b8..85852866f 100644
--- a/src/hci_cmd.h
+++ b/src/hci_cmd.h
@@ -112,6 +112,7 @@ extern const hci_cmd_t hci_qos_setup;
 extern const hci_cmd_t hci_read_bd_addr;
 extern const hci_cmd_t hci_read_buffer_size;
 extern const hci_cmd_t hci_read_encryption_key_size;
+extern const hci_cmd_t hci_read_inquiry_scan_activity;
 extern const hci_cmd_t hci_read_le_host_supported;
 extern const hci_cmd_t hci_read_link_policy_settings;
 extern const hci_cmd_t hci_read_link_supervision_timeout;
@@ -155,6 +156,7 @@ extern const hci_cmd_t hci_write_default_erroneous_data_reporting;
 extern const hci_cmd_t hci_write_default_link_policy_setting;
 extern const hci_cmd_t hci_write_extended_inquiry_response;
 extern const hci_cmd_t hci_write_inquiry_mode;
+extern const hci_cmd_t hci_write_inquiry_scan_activity;
 extern const hci_cmd_t hci_write_le_host_supported;
 extern const hci_cmd_t hci_write_link_policy_settings;
 extern const hci_cmd_t hci_write_link_supervision_timeout;
@@ -170,6 +172,14 @@ extern const hci_cmd_t hci_write_simple_pairing_debug_mode;
 extern const hci_cmd_t hci_write_simple_pairing_mode;
 extern const hci_cmd_t hci_write_synchronous_flow_control_enable;
 
+
+/**
+ * @param inquiry_scan_interval (* 0.625 ms)
+ * @param inquiry_scan_window (* 0.625 ms, must be <= inquiry_scan_interval)
+ */ 
+const hci_cmd_t hci_write_inquiry_scan_activity = {
+
+
 extern const hci_cmd_t hci_le_add_device_to_white_list;
 extern const hci_cmd_t hci_le_clear_white_list;
 extern const hci_cmd_t hci_le_connection_update;