diff --git a/README.md b/README.md
index 4ec3c1961b..3d6e7172dd 100644
--- a/README.md
+++ b/README.md
@@ -87,7 +87,8 @@ $ rustup update
 On Linux systems you may need to install libssl-dev, pkg-config, zlib1g-dev, etc.  On Ubuntu:
 
 ```bash
-$ sudo apt-get install libssl-dev pkg-config zlib1g-dev llvm clang
+$ sudo apt-get update
+$ sudo apt-get install libssl-dev libudev-dev pkg-config zlib1g-dev llvm clang
 ```
 
 Download the source code: