diff --git a/builtin.h b/builtin.h
index 7092e79..b67933f 100644
--- a/builtin.h
+++ b/builtin.h
@@ -2,11 +2,12 @@
  * @Author: 1ridic 
  * @Date: 2022-09-18 14:15:44 
  * @Last Modified by: 1ridic
- * @Last Modified time: 2022-09-18 14:41:38
+ * @Last Modified time: 2022-09-18 20:31:59
  */
 #ifndef _BUILTIN_H_
 #define _BUILTIN_H_
 
+#include "config.h"
 int getBuiltinNum();
 
 #endif
\ No newline at end of file
diff --git a/config.h b/config.h
new file mode 100644
index 0000000..15b646f
--- /dev/null
+++ b/config.h
@@ -0,0 +1,12 @@
+/*
+ * @Author: 1ridic 
+ * @Date: 2022-09-18 20:29:12 
+ * @Last Modified by: 1ridic
+ * @Last Modified time: 2022-09-18 20:29:55
+ */
+#ifndef _CONFIG_H_
+#define _CONFIG_H_
+
+#define LINE_BUF_SIZE 1024
+
+#endif
\ No newline at end of file
diff --git a/line.h b/line.h
index 846ba06..0f55eda 100644
--- a/line.h
+++ b/line.h
@@ -1,12 +1,12 @@
 /*
  * @Author: 1ridic 
  * @Date: 2022-09-18 14:14:28 
- * @Last Modified by:   1ridic 
- * @Last Modified time: 2022-09-18 14:14:28 
+ * @Last Modified by: 1ridic
+ * @Last Modified time: 2022-09-18 20:29:50
  */
 #ifndef _LINE_H_
 #define _LINE_H_
-#define LINE_BUF_SIZE 1024
+#include "config.h"
 
 char *readLine(void);
 char **splitLine(char *line);