diff --git a/README.md b/README.md
index db2418a7..d56a33a3 100644
--- a/README.md
+++ b/README.md
@@ -49,11 +49,13 @@ $ python setup.py develop
 The SDK supports signatures using [app-ethereum](https://github.com/LedgerHQ/app-ethereum),
 the Ethereum app for the Ledger hardware wallets.
 
-This has been tested successfully on Linux (amd64). 
+This has been tested successfully on Linux (amd64).
 Let us know if it works for you on other operating systems.
 
 Using a Ledger device on Linux requires root access or the setup of udev rules.
 
+Unlocking the device is required before using the relevant SDK functions.
+
 ### Debian / Ubuntu
 
 Install [ledger-wallets-udev](https://packages.debian.org/bookworm/ledger-wallets-udev).