diff --git a/plugins/fnm/README.md b/plugins/fnm/README.md
index 00fab5cd4..3267a57e6 100644
--- a/plugins/fnm/README.md
+++ b/plugins/fnm/README.md
@@ -2,8 +2,30 @@
 
 This plugin adds autocompletion for [fnm](https://github.com/Schniz/fnm) - a Node.js version manager.
 
-To use it, add `fnm` to the plugins array in your zshrc file:
+To use it, add `fnm` to the plugins array in your `.zshrc` file:
 
 ```zsh
 plugins=(... fnm)
 ```
+
+## Configuration Variables
+
+These settings should go in your `.zshrc` file, before Oh My Zsh is sourced.
+
+For example:
+
+```sh
+ZSH_FNM_AUTOSTART=true
+...
+plugins=(... fnm)
+source "$ZSH/oh-my-zsh.sh"
+```
+
+The following variables are available to this plugin customization:
+
+| Variable | Default | Meaning |
+| :------- | :-----: | ------- |
+| `ZSH_FNM_AUTOSTART` | `false` | Automatically starts fnm for the session, running the `fnm env` |
+| `ZSH_FNM_USE_ON_CD` | `true` | Switch the Node.js version based on the requirements of the current directory (recommended) |
+
+Check out the [official documentation](https://github.com/Schniz/fnm/blob/master/docs/commands.md) for the available fnm variables.
diff --git a/plugins/fnm/fnm.plugin.zsh b/plugins/fnm/fnm.plugin.zsh
index 6219025cd..b17ee19cf 100644
--- a/plugins/fnm/fnm.plugin.zsh
+++ b/plugins/fnm/fnm.plugin.zsh
@@ -2,6 +2,11 @@ if (( ! $+commands[fnm] )); then
   return
 fi
 
+# CONFIGURATION VARIABLES
+# Automatically start the fnm multishell
+: ${ZSH_FNM_AUTOSTART:=false} # opt-in to avoid duplicated sessions
+: ${ZSH_FNM_USE_ON_CD:=true} # upstream recommendation
+
 # If the completion file doesn't exist yet, we need to autoload it and
 # bind it to `fnm`. Otherwise, compinit will have already done that.
 if [[ ! -f "$ZSH_CACHE_DIR/completions/_fnm" ]]; then
@@ -11,3 +16,9 @@ if [[ ! -f "$ZSH_CACHE_DIR/completions/_fnm" ]]; then
 fi
 
 fnm completions --shell=zsh >| "$ZSH_CACHE_DIR/completions/_fnm" &|
+
+if [[ "$ZSH_FNM_AUTOSTART" == "true" ]]; then
+  local -a fnm_env_cmd
+  [[ "$ZSH_FNM_USE_ON_CD" == "true" ]] && fnm_env_cmd+=("--use-on-cd")
+  eval "$(fnm env --shell=zsh $fnm_env_cmd)"
+fi