diff --git a/README.md b/README.md
index 93df352..01dc022 100644
--- a/README.md
+++ b/README.md
@@ -96,7 +96,8 @@ The symbols are as follows:
 
 ```sh
 if [ -f "$(brew --prefix)/opt/bash-git-prompt/share/gitprompt.sh" ]; then
-    source "$(brew --prefix)/opt/bash-git-prompt/share/gitprompt.sh"
+  __GIT_PROMPT_DIR=$(brew --prefix)/opt/bash-git-prompt/share
+  source "$(brew --prefix)/opt/bash-git-prompt/share/gitprompt.sh"
 fi
 ```