diff --git a/src/kernel/entry/kernel.c b/src/kernel/entry/kernel.c
index 4c79edc9..4bb874a5 100644
--- a/src/kernel/entry/kernel.c
+++ b/src/kernel/entry/kernel.c
@@ -93,9 +93,10 @@ void _start(void) {
     printf("[warning] System disk has not been detected!\n");
 
   printf("=========================================\n");
-  printf("==     Cave-Like Operating System      ==\n");
-  printf("==      Copyright MalwarePad 2025      ==\n");
+  printf("=      Cave-Like Operating System       =\n");
+  printf("=       Copyright MalwarePad 2025       =\n");
   printf("=========================================\n\n");
+  printf("\n");
 
   while (1)
     run("/bin/bash", true, 0, 0);
diff --git a/target/usr/include/exfn.h b/target/usr/include/exfn.h
new file mode 100644
index 00000000..d44da3c7
--- /dev/null
+++ b/target/usr/include/exfn.h
@@ -0,0 +1,10 @@
+#include <stdio.h>
+#include <string.h>
+
+void write(char msg[]) {
+    printf("%s\n", msg);
+}
+
+int signal(int num) {
+  return num;
+}