diff --git a/README.md b/README.md
index 31af409..51300b3 100644
--- a/README.md
+++ b/README.md
@@ -121,6 +121,8 @@ You can save a session to a logfile with tee:
 fermi | tee -a fermi.log
 ```
 
+You can open a model in a tab (for instance in tmux), and in a terminal, run it with `fermi -f model.fermi`. If you then add a new line to the model in the first tab, it will also be processed by the second tab. I don't really know why this happens. 
+
 ## Different levels of complexity
 
 The mainline code has a bunch of complexity: variables, parenthesis, samples, beta distributions, number of samples, mixtures etc. In the simple/ folder:
diff --git a/makefile b/makefile
index 182a89b..339b7f8 100644
--- a/makefile
+++ b/makefile
@@ -5,7 +5,6 @@ run:
 	go run main/fermi.go main/error.go main/pretty.go
 
 install: fermi 
-	rm /usr/bin/fermi
-	rm /usr/bin/f
+	rm -f /usr/bin/fermi
 	sudo mv fermi /usr/bin/fermi
 	sudo ln -s /usr/bin/fermi /usr/bin/f