diff --git a/tools/drwatson/README.md b/tools/drwatson/README.md
index c9255dc..b7c4738 100644
--- a/tools/drwatson/README.md
+++ b/tools/drwatson/README.md
@@ -5,6 +5,10 @@ It requires Ubuntu-based system and Python 3.4+.
 
 ## Setup Drwatson
 
+First make sure that all submodules are checked out: `git submodule update --init --recursive`.
+
+Then execute the setup script as superuser, and you're ready to go:
+
 ```bash
 sudo ./setup.sh
 sudo ./drwatson_epm_v3.py can0
@@ -15,5 +19,6 @@ sudo ./drwatson_epm_v3.py can0
 Drwatson can upload firmware automatically, but if you want to do it yourself, here's how:
 
 ```bash
+cd drwatson
 ./lpc11c00_can_bootloader.py can0 firmware.bin
 ```
diff --git a/tools/drwatson/setup.sh b/tools/drwatson/setup.sh
index 8c6aa9a..646d445 100755
--- a/tools/drwatson/setup.sh
+++ b/tools/drwatson/setup.sh
@@ -7,6 +7,6 @@ fi
 
 set -o xtrace
 
-apt-get install -y python3 python3-pip
+apt-get install -y python3 python3-pip can-utils
 
 pip3 install colorama 'uavcan>=0.0.dev0'