diff --git a/docs/build.md b/docs/build.md
index 375f01b..39a46fc 100644
--- a/docs/build.md
+++ b/docs/build.md
@@ -9,7 +9,9 @@ cd flix
 
 ## Simulation
 
-### Ubuntu
+### Ubuntu 20.04
+
+The latest version of Ubuntu supported by Gazebo 11 simulator is 20.04. If you have a newer version, consider using a virtual machine.
 
 1. Install Arduino CLI: