diff --git a/README-Japanese.md b/README-Japanese.md
index 05b59baf..aa0353bc 100644
--- a/README-Japanese.md
+++ b/README-Japanese.md
@@ -280,6 +280,7 @@ cargo build --release --target=x86_64-unknown-linux-musl
 ```
 
 MUSLバイナリは`./target/x86_64-unknown-linux-musl/release/`ディレクトリ配下に作成されます。
+MUSLバイナリはGNUバイナリより約15％遅いです。
 
 ## Linuxでのコンパイルの注意点
 
diff --git a/README.md b/README.md
index ca248736..5a8db360 100644
--- a/README.md
+++ b/README.md
@@ -275,6 +275,7 @@ cargo build --release --target=x86_64-unknown-linux-musl
 ```
 
 The MUSL binary will be created in the `./target/x86_64-unknown-linux-musl/release/` directory.
+MUSL binaries are are about 15% slower than the GNU binaries.
 
 # Running Hayabusa