diff --git a/README.md b/README.md
index 87ab0a3..30c3ee3 100644
--- a/README.md
+++ b/README.md
@@ -38,6 +38,12 @@ It also allows to inspect and validate the element structure of MP4 and Matroska
 ## Text encoding, Unicode support
 The library is aware of different text encodings and can convert between different encodings using iconv.
 
+### Windows specific
+A workaround to support filenames containing non-ASCII characters (despite the lack of an UTF-8
+supporting `std::fstream` under Windows) can be enabled by adding `-DUSE_NATIVE_FILE_BUFFER=ON`
+to the CMake arguments **when building `c++utilities`**. It is *not* sufficient to specify this
+option only when building `tagparser`.
+
 ## Usage
 For examples check out the command line interface of [Tag Editor](https://github.com/Martchus/tageditor).
 API documentation can be generated using Doxygen with `make tagparser_apidoc`.