diff --git a/README.md b/README.md
index e1a9656..4ea5e26 100644
--- a/README.md
+++ b/README.md
@@ -87,6 +87,8 @@ make DESTDIR="/temporary/install/location" install
   However, this will only affect applications. To force linking statically when building shared libraries set `STATIC_LIBRARY_LINKAGE=ON`.
 * If thread local storage is not supported by your compiler/platform (might be the case on MacOS), you can disable making use of it
   via `ENABLE_THREAD_LOCAL=OFF`.
+* To disable use of `std::filesystem`, set `USE_STANDARD_FILESYSTEM=OFF`. This is required when building for MacOS and Android at the time of
+  writing this documentation. Note that the Bash completion will not be able to suggest files and directory with `USE_STANDARD_FILESYSTEM=OFF`.
 * For more detailed documentation, see the documentation about build variables (in
   [directory doc](https://github.com/Martchus/cpp-utilities/blob/master/doc/buildvariables.md) and
   in Doxygen version accessible via "Related Pages").
diff --git a/doc/buildvariables.md b/doc/buildvariables.md
index 8c44518..826b7a9 100644
--- a/doc/buildvariables.md
+++ b/doc/buildvariables.md
@@ -86,6 +86,10 @@ None of these are enabled or set by default, unless stated otherwise.
     * This feature is implemented in `c++utilities`, so the option must be specified
       when building `c++utilities`. Specifying it only when building eg. `tagparser`
       has *no* effect.
+* `USE_STANDARD_FILESYSTEM=ON/OFF`: enables use of `std::filesystem` (default)
+    * Disabing this is required when building for MacOS and Android at the time of
+      writing this documentation.
+    * Bash completion will not be able to suggest files and directory when disabled.
 
 #### Variables for specifying location of 3rd party dependencies
 The build script tries to find the required dependencies at standard loctions