diff --git a/.gitignore b/.gitignore
index 542db4c..838d06f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,5 @@
 build*
+.cache
 .directory
 .clangd
 v2ray_config/proxy
diff --git a/readme.md b/readme.md
index ad56083..881868b 100644
--- a/readme.md
+++ b/readme.md
@@ -65,7 +65,7 @@ Main feature:
 
 ### build
 
-- before build, install depencies: clang(if to build bpf obj from scratch), nlohmann-json, libbpf
+- before build, install depencies: clang, nlohmann-json, libbpf, bpf(bpftool)
 - then cmake standard build
 
 ```bash