diff --git a/README.md b/README.md
index 8212a68e076f8d7c087247c9708818e5bb769fce..5621d342a972815e0f902a00d60a42f26e43b5d0 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,13 @@ Reference CATS/FELINET I-gate/digipeater for the Raspberry Pi. Requires an I-Gat
 
 ## Building
 
-To build the software, you will need to install [Rustup](https://rustup.rs/). You'll also need git. After these are installed, restart your terminal, or open a new one. Then run these commands:
+To build the software, you will need to install [Rustup](https://rustup.rs/). You'll also need to install some dependencies:
+
+```bash
+sudo apt install git protobuf-compiler
+```
+
+After these are installed, restart your terminal, or open a new one. Then run these commands:
 
 ```bash
 git clone https://gitlab.scd31.com/cats/igate