diff --git a/README.md b/README.md
index 63a52503..a39c909a 100644
--- a/README.md
+++ b/README.md
@@ -33,8 +33,8 @@
 - [Jansson](https://digip.org/jansson/)
 - [libcurl](https://curl.se/libcurl/)
 - [OpenSSL](https://www.openssl.org/)
-- [Zstandard](https://facebook.github.io/zstd/) (for Rack's `tar.zstd` patch format)
-- [libarchive](https://libarchive.org/) (for Rack's `tar.zstd` patch format)
+- [Zstandard](https://facebook.github.io/zstd/) (for Rack's `.tar.zstd` patch format)
+- [libarchive](https://libarchive.org/) (for Rack's `.tar.zstd` patch format)
 - [PFFFT](https://bitbucket.org/jpommier/pffft/)
 - [libspeexdsp](https://gitlab.xiph.org/xiph/speexdsp/-/tree/master/libspeexdsp) (for Rack's fixed-ratio resampler)
 - [libsamplerate](https://github.com/libsndfile/libsamplerate) (for Rack's variable-ratio resampler)