diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index bd49834d..1a9bcec9 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -5,6 +5,6 @@ When adding new "Hello World" programs, please name the file according to the la
 
 Use
 ```bash
-cat README_nolist.md > README.md; echo >> README.md; echo "### This repository surrently contains "Hello World" programs in the following languages:" >> README.rb; ruby list_langs.rb >> README.md
+cat README_nolist.md > README.md; echo >> README.md; echo "### This repository surrently contains "Hello World" programs in the following languages:" >> README.md; ruby list_langs.rb >> README.md
 ```
-for updating the list of languages in `README.md`.
+for updating the list of languages in `README.md` (make sure you are in the repository's root directory when invoking those commands).