diff --git a/doc/install_poetry.md b/doc/install_poetry.md
index abdad9f7596ac036645af2eca9ae81bfae0b9e31..0c806a042db288ba9116e96e75e9ba01e28b593b 100644
--- a/doc/install_poetry.md
+++ b/doc/install_poetry.md
@@ -14,6 +14,7 @@ sudo dnf install libsodium # Fedora
 ### On Debian Buster
 ```bash
 sudo apt install python3-pip python3-venv
+sudo apt install libffi-dev # Required on ARMbian
 pip3 install poetry --user
 ```