diff --git a/README.md b/README.md
index 24f7bb5c..e9a2726d 100644
--- a/README.md
+++ b/README.md
@@ -10,7 +10,8 @@ Pull submodules:
     git submodule update --init --recursive
 
 Install CMake and build the C++ tools:
-    sudo apt-get install cmake3
+    sudo apt-get install cmake # version 3.5.0 or later required,
+                               # for Ubuntu Trusty pkg is called cmake3
     mkdir build
     pushd build
     cmake ..