diff --git a/README.md b/README.md
index 11c53be..26adcaf 100644
--- a/README.md
+++ b/README.md
@@ -84,6 +84,7 @@ This function may also be called interactively.
 The author uses the following configuration snippet before calling `exec-path-from-shell-initialize`:
 
 ```el
+(require 'exec-path-from-shell)
 (dolist (var '("SSH_AUTH_SOCK" "SSH_AGENT_PID" "GPG_AGENT_INFO" "LANG" "LC_CTYPE" "NIX_SSL_CERT_FILE" "NIX_PATH"))
   (add-to-list 'exec-path-from-shell-variables var))
 ```