diff --git a/ext/libraries/libsignal-client/README.md b/ext/libraries/libsignal-client/README.md
index 31be7c3..1a67ece 100644
--- a/ext/libraries/libsignal-client/README.md
+++ b/ext/libraries/libsignal-client/README.md
@@ -16,3 +16,8 @@ to build the library for `x86-64`, `armv7` and `arm64`
 ## Why?
 
 Building libsignal-client every time a new docker image gets released takes really long (especially for cross platform builds with docker/buildx and QEMU). Furthermore, due to this bug here (https://github.com/docker/buildx/issues/395) we would need to use an ugly workaround for that right now. As libsignal-client isn't released very often I guess it's okay to manually build a new version once in a while.  
+
+## Pitfalls
+
+1. `cross` requires a Rust installation via [`rustup`](https://www.rust-lang.org/tools/install), otherwise you might receive a _toolchain is not fully qualified_-Error.
+2. Your user must have permission to directly talk to the Docker daemon using the `docker` command. To avoid running as root, [you can add your user to the docker group and reboot](https://docs.docker.com/engine/install/linux-postinstall/).