diff --git a/README.md b/README.md
index 9764b3d1..d6cff2d2 100644
--- a/README.md
+++ b/README.md
@@ -32,6 +32,8 @@ CubeSatSim runs on the Bullseye or Buster version of Raspberry Pi OS (Desktop or
 
 To get the software follow these steps:
 
+`sudo apt-get update`
+
 `sudo apt-get install -y git`
 
 `git clone http://github.com/alanbjohnston/CubeSatSim.git`