diff --git a/INSTALL.md b/INSTALL.md
index 72fba04..f021c49 100644
--- a/INSTALL.md
+++ b/INSTALL.md
@@ -42,7 +42,7 @@ To install zsh-syntax-highlighting under oh-my-zsh:
 
 1. Clone this repository in oh-my-zsh's plugins directory:
 
-        git clone https://github.com/zsh-users/zsh-syntax-highlighting.git ~/.oh-my-zsh/custom/plugins/zsh-syntax-highlighting
+        git clone https://github.com/zsh-users/zsh-syntax-highlighting.git ${ZSH_CUSTOM:-~/.oh-my-zsh/custom}/plugins/zsh-syntax-highlighting
 
 2. Activate the plugin in `~/.zshrc`: