diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 475b1155d..2c1d60e60 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -20,6 +20,7 @@ As a contributor, you are expected to fork this repository, work on your own for
 
 ```
 cd openzeppelin-solidity
+git remote add upstream https://github.com/OpenZeppelin/openzeppelin-solidity.git
 git fetch upstream
 git pull --rebase upstream master
 ```