diff --git a/include/exit_code.h b/include/flag.h
similarity index 70%
rename from include/exit_code.h
rename to include/flag.h
index 9dd375b..dc0cf2c 100644
--- a/include/exit_code.h
+++ b/include/flag.h
@@ -1,6 +1,14 @@
 #ifndef _EXIT_CODE_H_
 #define _EXIT_CODE_H_
 
+#ifndef TRUE
+#define TRUE 1
+#endif
+
+#ifndef FALSE
+#define FALSE 0
+#endif
+
 #define EXIT_NORMAL 0
 #define EXIT_FILE_ERROR 1
 #define EXIT_FORK_ERROR 2
diff --git a/src/common.c b/src/common.c
index 9dceb22..d1021d7 100644
--- a/src/common.c
+++ b/src/common.c
@@ -2,7 +2,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include "cJSON.h"
-#include "exit_code.h"
+#include "flag.h"
 
 char **adguard_command = NULL;
 char **overture_command = NULL;
diff --git a/src/process.c b/src/process.c
index aefa793..b8b8224 100644
--- a/src/process.c
+++ b/src/process.c
@@ -7,15 +7,7 @@
 #include <sys/wait.h>
 #include <sys/prctl.h>
 #include "common.h"
-#include "exit_code.h"
-
-#ifndef TRUE
-#define TRUE 1
-#endif
-
-#ifndef FALSE
-#define FALSE 0
-#endif
+#include "flag.h"
 
 int exiting = 0;
 
@@ -73,7 +65,7 @@ void server_exit(int exit_code) { // kill sub process and exit
     if (custom_pgid != 0) {
         ret = waitpid(-custom_pgid, &status, WNOHANG);
         if (ret == 0) { // custom script still running
-            fprintf(stderr, "[ClearDNS] Kill custom script.\n");
+            fprintf(stderr, "[ClearDNS] Kill custom script. (pgid = %d)\n", custom_pgid);
             kill(-custom_pgid, SIGTERM); // kill process group
         }
     }