diff --git a/docs/docs/dev-setup.md b/docs/docs/dev-setup.md
index 4fa01a85..b6edc4fc 100644
--- a/docs/docs/dev-setup.md
+++ b/docs/docs/dev-setup.md
@@ -45,6 +45,11 @@ sudo apt install -y \
 	xz-utils
 ```
 
+:::note
+Ubuntu 18.04 LTS release packages a version of CMake that is too old. Please upgrade to Ubuntu 20.04 LTS
+or download and install CMake version 3.13.1 or newer manually.
+:::
+
 ### Fedora
 
 TODO