diff --git a/004/codex-004.tex b/004/codex-004.tex
index b70cf20..465de8a 100644
--- a/004/codex-004.tex
+++ b/004/codex-004.tex
@@ -145,6 +145,8 @@ https://superuser.com/questions/7414/how-can-i-search-the-bash-history-and-rerun
 
 https://www.gnu.org/savannah-checkouts/gnu/bash/manual/bash.html\#Bindable-Readline-Commands
 
+https://stackoverflow.com/questions/7131670/make-a-bash-alias-that-takes-a-parameter
+
 \chapter{What's to Like About Linux}
 
 \section{bash Aliases for \texttt{git}}