diff --git a/common/inc/tx_api.h b/common/inc/tx_api.h
index a5c738c39..c585a29e5 100644
--- a/common/inc/tx_api.h
+++ b/common/inc/tx_api.h
@@ -26,7 +26,7 @@
 /*  APPLICATION INTERFACE DEFINITION                       RELEASE        */
 /*                                                                        */
 /*    tx_api.h                                            PORTABLE C      */
-/*                                                           6.3.0        */
+/*                                                           6.x          */
 /*  AUTHOR                                                                */
 /*                                                                        */
 /*    William E. Lamie, Microsoft Corporation                             */
@@ -101,6 +101,9 @@
 /*                                            added option for random     */
 /*                                            number stack filling,       */
 /*                                            resulting in version 6.3.0  */
+/*  xx-xx-xxxx      Tiejun Zhou             Modified comment(s),          */
+/*                                            update version number,      */
+/*                                            resulting in version 6.x    */
 /*                                                                        */
 /**************************************************************************/
 
@@ -139,7 +142,7 @@ extern   "C" {
 
 #define AZURE_RTOS_THREADX
 #define THREADX_MAJOR_VERSION           6
-#define THREADX_MINOR_VERSION           3
+#define THREADX_MINOR_VERSION           4
 #define THREADX_PATCH_VERSION           0
 
 /* Define the following symbol for backward compatibility */
diff --git a/common_smp/inc/tx_api.h b/common_smp/inc/tx_api.h
index 19a8a1a95..504fe3c58 100644
--- a/common_smp/inc/tx_api.h
+++ b/common_smp/inc/tx_api.h
@@ -26,7 +26,7 @@
 /*  APPLICATION INTERFACE DEFINITION                       RELEASE        */
 /*                                                                        */
 /*    tx_api.h                                            PORTABLE SMP    */
-/*                                                           6.3.0        */
+/*                                                           6.x          */
 /*  AUTHOR                                                                */
 /*                                                                        */
 /*    William E. Lamie, Microsoft Corporation                             */
@@ -89,6 +89,9 @@
 /*                                            added option for random     */
 /*                                            number stack filling,       */
 /*                                            resulting in version 6.3.0  */
+/*  xx-xx-xxxx      Tiejun Zhou             Modified comment(s),          */
+/*                                            update version number,      */
+/*                                            resulting in version 6.x    */
 /*                                                                        */
 /**************************************************************************/
 
@@ -140,7 +143,7 @@ extern   "C" {
 
 #define AZURE_RTOS_THREADX
 #define THREADX_MAJOR_VERSION           6
-#define THREADX_MINOR_VERSION           3
+#define THREADX_MINOR_VERSION           4
 #define THREADX_PATCH_VERSION           0
 
 /* Define the following symbol for backward compatibility */