diff --git a/README.md b/README.md
index 9a6bebb..199505b 100644
--- a/README.md
+++ b/README.md
@@ -67,7 +67,7 @@ cpp-httplib supports multiple TLS backends through an abstraction layer:
 | Backend | Define | Libraries | Notes |
 | :------ | :----- | :-------- | :---- |
 | OpenSSL | `CPPHTTPLIB_OPENSSL_SUPPORT` | `libssl`, `libcrypto` | [3.0 or later](https://www.openssl.org/policies/releasestrat.html) required |
-| Mbed TLS | `CPPHTTPLIB_MBEDTLS_SUPPORT` | `libmbedtls`, `libmbedx509`, `libmbedcrypto` | 2.x and 3.x supported (auto-detected) |
+| Mbed TLS | `CPPHTTPLIB_MBEDTLS_SUPPORT` | `libmbedtls`, `libmbedx509`, `libmbedcrypto` | 2.x, 3.x, and 4.x supported (auto-detected); 4.x renames `libmbedcrypto` to `libtfpsacrypto` |
 | wolfSSL | `CPPHTTPLIB_WOLFSSL_SUPPORT` | `libwolfssl` | 5.x supported; must build with `--enable-opensslall` |
 
 > [!NOTE]
diff --git a/docs-src/pages/en/tour/05-tls-setup.md b/docs-src/pages/en/tour/05-tls-setup.md
index 40eee3c..7ca72e9 100644
--- a/docs-src/pages/en/tour/05-tls-setup.md
+++ b/docs-src/pages/en/tour/05-tls-setup.md
@@ -79,6 +79,8 @@ cpp-httplib also supports Mbed TLS and wolfSSL in addition to OpenSSL. You can s
 | Mbed TLS | `CPPHTTPLIB_MBEDTLS_SUPPORT` | `libmbedtls`, `libmbedx509`, `libmbedcrypto` |
 | wolfSSL | `CPPHTTPLIB_WOLFSSL_SUPPORT` | `libwolfssl` |
 
+Mbed TLS 2.x, 3.x, and 4.x are all supported and auto-detected. Note that Mbed TLS 4.x renames `libmbedcrypto` to `libtfpsacrypto`, so link against that instead.
+
 This tour assumes OpenSSL, but the API is the same regardless of which backend you choose.
 
 ## Next Step
diff --git a/docs-src/pages/ja/tour/05-tls-setup.md b/docs-src/pages/ja/tour/05-tls-setup.md
index ab6b8d1..f54c55d 100644
--- a/docs-src/pages/ja/tour/05-tls-setup.md
+++ b/docs-src/pages/ja/tour/05-tls-setup.md
@@ -79,6 +79,8 @@ cpp-httplibはOpenSSL以外にも、Mbed TLSとwolfSSLに対応しています
 | Mbed TLS | `CPPHTTPLIB_MBEDTLS_SUPPORT` | `libmbedtls`, `libmbedx509`, `libmbedcrypto` |
 | wolfSSL | `CPPHTTPLIB_WOLFSSL_SUPPORT` | `libwolfssl` |
 
+Mbed TLSは2.x、3.x、4.xいずれも対応していて、自動判定されます。4.xでは`libmbedcrypto`が`libtfpsacrypto`という名前に変わっているので、リンクするライブラリはそちらに読み替えてください。
+
 このTourではOpenSSLを前提に進めますが、APIはどのバックエンドでも共通です。
 
 ## 次のステップ