diff --git a/SC2013.md b/SC2013.md
index 74c2818..14e5930 100644
--- a/SC2013.md
+++ b/SC2013.md
@@ -31,6 +31,7 @@ or without a subshell, with a pipe (more portable, but write a file on the files
 
 ```sh
 mkfifo mypipe
+grep -v '^ *#' < file > mypipe &
 while IFS= read -r line
 do
   echo "Line: $line"