diff --git a/readme.md b/readme.md
index 7a19869..699d7a4 100644
--- a/readme.md
+++ b/readme.md
@@ -75,6 +75,8 @@ Additional LSP server installation [details](https://github.com/mattleong/Cosmic
 :CosmicUpdate
 ```
 
+By default, this will assume the Cosmic git directory is placed at `vim.fn.stdpath('config')`, i.e. `~/.config/nvim`. Otherwise, you may define the shell environment variable `COSMICNVIM_INSTALL_DIR`.
+
 #### Reload user config
 
 ```