diff --git a/project/lib/README.md b/project/lib/README.md
index 520c2a2f9..111504886 100644
--- a/project/lib/README.md
+++ b/project/lib/README.md
@@ -19,8 +19,10 @@ Lime includes code from several other C/C++ libraries, listed below. Lime prefer
 - [**Pixman**](http://pixman.org/) | [primary repo](https://gitlab.freedesktop.org/pixman/pixman) | [GitHub mirror](https://github.com/freedesktop/pixman)
 - [**libpng**](http://www.libpng.org/pub/png/libpng.html) | [primary repo](https://sourceforge.net/p/libpng/code)
 - [**SDL**](https://www.libsdl.org/) | [primary repo](https://github.com/libsdl-org/SDL)
-- [**tiny file dialogs**](https://sourceforge.net/projects/tinyfiledialogs/) | [primary repo](https://sourceforge.net/p/tinyfiledialogs/code) | [unofficial GitHub mirror](https://github.com/openfl/libtinyfiledialogs)
+- [**tiny file dialogs**](https://sourceforge.net/projects/tinyfiledialogs/) | [primary repo](https://sourceforge.net/p/tinyfiledialogs/code) | [unofficial GitHub mirror](https://github.com/openfl/libtinyfiledialogs)[^1]
 - [**Vorbis**](https://www.xiph.org/vorbis/) | [primary repo](https://github.com/xiph/vorbis)
 - [**libvpx**](https://www.webmproject.org/tools/) | [primary repo](https://chromium.googlesource.com/webm/libvpx/) | [GitHub mirror](https://github.com/webmproject/libvpx/)
 - [**libwebm**](https://www.webmproject.org/about/) | [primary repo](https://chromium.googlesource.com/webm/libwebm) | [GitHub mirror](https://github.com/webmproject/libwebm)
 - [**zlib**](https://zlib.net/) | [primary repo](https://github.com/madler/zlib)
+
+[^1]: Attempting to make a shallow clone of tiny file dialogs' SourceForge repo (as GitHub Actions does) usually produces the error "Server does not allow request for unadvertised object." Only the most recent commit is "advertised," and all others cause the error. As long as this is the case, Lime will use the unofficial mirror as a workaround.