diff --git a/README.md b/README.md
index ee5e747..33e11f9 100644
--- a/README.md
+++ b/README.md
@@ -199,10 +199,15 @@ The following rules apply for default cluster selection:
 
 1. If there's just one cluster configured (either via environment
    variables or config), this one will be selected.
-2. If there is one cluster configured with the `default` flag `true`,
+2. If a cluster have been specified with `-C <name>`, use this.
+3. If there is one cluster configured with the `default` flag `true`,
    use this one.
    
-Use `esctl cluster ls` to check status and see which one would be used.
+Use `esctl cluster ls` to check status and see which one would be
+used.
+
+Please be aware, that prior to use a cluster and send API requests to
+it, `esctl` checks the connectivity to it first.
 
 ## Installation