diff --git a/src/41-xdp-tcpdump/README.md b/src/41-xdp-tcpdump/README.md
index 0deffc5..3e234b2 100644
--- a/src/41-xdp-tcpdump/README.md
+++ b/src/41-xdp-tcpdump/README.md
@@ -140,7 +140,7 @@ int xdp_pass(struct xdp_md *ctx)
     bpf_ringbuf_submit(event, 0);
 
     // Optional: Print a debug message
-    bpf_printk("Captured TCP header (%d bytes)", tcp_header_bytes);
+    bpf_printk("Captured TCP header (%u bytes)", tcp_header_bytes);
 
     return XDP_PASS;
 }
@@ -215,7 +215,7 @@ bpf_ringbuf_submit(event, 0);
 The `bpf_printk` function logs messages to the kernel's trace pipe, which can be invaluable for debugging.
 
 ```c
-bpf_printk("Captured TCP header (%d bytes)", tcp_header_bytes);
+bpf_printk("Captured TCP header (%u bytes)", tcp_header_bytes);
 ```
 
 ## User-Space Code Analysis
diff --git a/src/41-xdp-tcpdump/README.zh.md b/src/41-xdp-tcpdump/README.zh.md
index 59e2f89..3554049 100644
--- a/src/41-xdp-tcpdump/README.zh.md
+++ b/src/41-xdp-tcpdump/README.zh.md
@@ -138,7 +138,7 @@ int xdp_pass(struct xdp_md *ctx)
     bpf_ringbuf_submit(event, 0);
 
     // 可选：打印调试信息
-    bpf_printk("Captured TCP header (%d bytes)", tcp_header_bytes);
+    bpf_printk("Captured TCP header (%u bytes)", tcp_header_bytes);
 
     return XDP_PASS;
 }
@@ -213,7 +213,7 @@ bpf_ringbuf_submit(event, 0);
 `bpf_printk` 函数将消息记录到内核的跟踪管道，对于调试非常有用。
 
 ```c
-bpf_printk("Captured TCP header (%d bytes)", tcp_header_bytes);
+bpf_printk("Captured TCP header (%u bytes)", tcp_header_bytes);
 ```
 
 ## 用户空间代码分析