diff --git a/target/inc/wmi_unified.h b/target/inc/wmi_unified.h
index a031d93a3ea2..f863444f8534 100644
--- a/target/inc/wmi_unified.h
+++ b/target/inc/wmi_unified.h
@@ -1810,6 +1810,11 @@ typedef struct {
 	wmi_ppe_threshold ppet;
 	/* see section 8.4.2.213 from draft r8 of 802.11ax */
 	A_UINT32 he_cap_info;
+	/*
+	 * An HT STA shall not allow transmission of more than one MPDU start
+	 * within the time limit described in the MPDU maximum density field.
+	 */
+	A_UINT32 mpdu_density; /* units are microseconds */
 } wmi_service_ready_ext_event_fixed_param;
 
 typedef enum {
diff --git a/target/inc/wmi_version.h b/target/inc/wmi_version.h
index 29cafa11fbc7..083a9e52b243 100644
--- a/target/inc/wmi_version.h
+++ b/target/inc/wmi_version.h
@@ -36,7 +36,7 @@
 #define __WMI_VER_MINOR_    0
 /** WMI revision number has to be incremented when there is a
  *  change that may or may not break compatibility */
-#define __WMI_REVISION_ 208
+#define __WMI_REVISION_ 209
 
 /** The Version Namespace should not be normally changed. Only
  *  host and firmware of the same WMI namespace will work