diff --git a/demo/non_os/stm32f10x/components/easylogger/inc/elog_cfg.h b/demo/non_os/stm32f10x/components/easylogger/inc/elog_cfg.h
index 0dc7bd0..db485b6 100644
--- a/demo/non_os/stm32f10x/components/easylogger/inc/elog_cfg.h
+++ b/demo/non_os/stm32f10x/components/easylogger/inc/elog_cfg.h
@@ -29,14 +29,14 @@
 #ifndef _ELOG_CFG_H_
 #define _ELOG_CFG_H_
 
-/* setting static output log level */
-#define ELOG_OUTPUT_LVL                      ELOG_LVL_VERBOSE
 /* enable log output. default open this macro */
 #define ELOG_OUTPUT_ENABLE
-/* output line number max length */
-#define ELOG_LINE_NUM_MAX_LEN                5
+/* setting static output log level */
+#define ELOG_OUTPUT_LVL                      ELOG_LVL_VERBOSE
 /* log buffer size */
 #define ELOG_BUF_SIZE                        256
+/* output line number max length */
+#define ELOG_LINE_NUM_MAX_LEN                5
 /* output filter's tag max length */
 #define ELOG_FILTER_TAG_MAX_LEN              16
 /* output filter's keyword max length */
diff --git a/demo/os/linux/easylogger/inc/elog_cfg.h b/demo/os/linux/easylogger/inc/elog_cfg.h
index f7c2579..9fa69bf 100644
--- a/demo/os/linux/easylogger/inc/elog_cfg.h
+++ b/demo/os/linux/easylogger/inc/elog_cfg.h
@@ -29,14 +29,14 @@
 #ifndef _ELOG_CFG_H_
 #define _ELOG_CFG_H_
 
-/* setting static output log level */
-#define ELOG_OUTPUT_LVL                      ELOG_LVL_VERBOSE
 /* enable log output. default open this macro */
 #define ELOG_OUTPUT_ENABLE
-/* output line number max length */
-#define ELOG_LINE_NUM_MAX_LEN                5
+/* setting static output log level */
+#define ELOG_OUTPUT_LVL                      ELOG_LVL_VERBOSE
 /* log buffer size */
 #define ELOG_BUF_SIZE                        512
+/* output line number max length */
+#define ELOG_LINE_NUM_MAX_LEN                5
 /* output filter's tag max length */
 #define ELOG_FILTER_TAG_MAX_LEN              16
 /* output filter's keyword max length */
diff --git a/demo/os/linux/main.c b/demo/os/linux/main.c
index 526f7fc..1317ef3 100644
--- a/demo/os/linux/main.c
+++ b/demo/os/linux/main.c
@@ -67,7 +67,7 @@ int main(void) {
     /* test logger output */
     test_elog();
 
-	return EXIT_SUCCESS;
+    return EXIT_SUCCESS;
 }
 
 /**
diff --git a/demo/os/rt-thread/stm32f10x/components/easylogger/inc/elog_cfg.h b/demo/os/rt-thread/stm32f10x/components/easylogger/inc/elog_cfg.h
index 0dc7bd0..db485b6 100644
--- a/demo/os/rt-thread/stm32f10x/components/easylogger/inc/elog_cfg.h
+++ b/demo/os/rt-thread/stm32f10x/components/easylogger/inc/elog_cfg.h
@@ -29,14 +29,14 @@
 #ifndef _ELOG_CFG_H_
 #define _ELOG_CFG_H_
 
-/* setting static output log level */
-#define ELOG_OUTPUT_LVL                      ELOG_LVL_VERBOSE
 /* enable log output. default open this macro */
 #define ELOG_OUTPUT_ENABLE
-/* output line number max length */
-#define ELOG_LINE_NUM_MAX_LEN                5
+/* setting static output log level */
+#define ELOG_OUTPUT_LVL                      ELOG_LVL_VERBOSE
 /* log buffer size */
 #define ELOG_BUF_SIZE                        256
+/* output line number max length */
+#define ELOG_LINE_NUM_MAX_LEN                5
 /* output filter's tag max length */
 #define ELOG_FILTER_TAG_MAX_LEN              16
 /* output filter's keyword max length */
diff --git a/demo/os/windows/easylogger/inc/elog_cfg.h b/demo/os/windows/easylogger/inc/elog_cfg.h
index f7c2579..9fa69bf 100644
--- a/demo/os/windows/easylogger/inc/elog_cfg.h
+++ b/demo/os/windows/easylogger/inc/elog_cfg.h
@@ -29,14 +29,14 @@
 #ifndef _ELOG_CFG_H_
 #define _ELOG_CFG_H_
 
-/* setting static output log level */
-#define ELOG_OUTPUT_LVL                      ELOG_LVL_VERBOSE
 /* enable log output. default open this macro */
 #define ELOG_OUTPUT_ENABLE
-/* output line number max length */
-#define ELOG_LINE_NUM_MAX_LEN                5
+/* setting static output log level */
+#define ELOG_OUTPUT_LVL                      ELOG_LVL_VERBOSE
 /* log buffer size */
 #define ELOG_BUF_SIZE                        512
+/* output line number max length */
+#define ELOG_LINE_NUM_MAX_LEN                5
 /* output filter's tag max length */
 #define ELOG_FILTER_TAG_MAX_LEN              16
 /* output filter's keyword max length */
diff --git a/demo/os/windows/main.c b/demo/os/windows/main.c
index dbd95df..fecb755 100644
--- a/demo/os/windows/main.c
+++ b/demo/os/windows/main.c
@@ -67,7 +67,7 @@ int main(void) {
     /* test logger output */
     test_elog();
 
-	return EXIT_SUCCESS;
+    return EXIT_SUCCESS;
 }
 
 /**
diff --git a/easylogger/inc/elog_cfg.h b/easylogger/inc/elog_cfg.h
index d88d40d..9d4d626 100644
--- a/easylogger/inc/elog_cfg.h
+++ b/easylogger/inc/elog_cfg.h
@@ -29,14 +29,14 @@
 #ifndef _ELOG_CFG_H_
 #define _ELOG_CFG_H_
 
-/* setting static output log level */
-#define ELOG_OUTPUT_LVL                      /* @note you must define it for a value */
 /* enable log output. default open this macro */
 #define ELOG_OUTPUT_ENABLE
-/* output line number max length */
-#define ELOG_LINE_NUM_MAX_LEN                /* @note you must define it for a value */
+/* setting static output log level */
+#define ELOG_OUTPUT_LVL                      /* @note you must define it for a value */
 /* log buffer size */
 #define ELOG_BUF_SIZE                        /* @note you must define it for a value */
+/* output line number max length */
+#define ELOG_LINE_NUM_MAX_LEN                /* @note you must define it for a value */
 /* output filter's tag max length */
 #define ELOG_FILTER_TAG_MAX_LEN              /* @note you must define it for a value */
 /* output filter's keyword max length */