Add instruction for tk kubectl plugin

install/README.md

@@ -15,6 +15,12 @@ The install script does the following:
 * copies the tk binary to `/usr/local/bin`
 * removes the temporary directory
 
+If you want to use tk as a kubectl plugin, rename the binary to `kubectl-tk`:
+
+```sh
+mv /usr/local/bin/tk /usr/local/bin/kubectl-tk
+```
+
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