diff --git a/README.md b/README.md
index 3fe2214..22b9d64 100644
--- a/README.md
+++ b/README.md
@@ -5,7 +5,7 @@ Environment tweaks for everyday happiness.
 ## Setup
 
 ```bash
-git clone git@github.com:mcataford/env.git <path-of-your-choosing> | . ./setup
+git clone git@github.com:mcataford/env.git <path-of-your-choosing> | . ./install.sh
 ```
 
 The setup script will look for pre-existing managed blocks and will not update the file if one is found.
@@ -22,7 +22,7 @@ The package is structured as such:
 
 ```
 env/
-    setup # Adds bootstrap block to your shell's config file.
+    install.sh # Adds bootstrap block to your shell's config file.
     shell_extras # Functions, aliases and exports for the shell.
     extras.vim # Common config for NVIM.
 ```
diff --git a/setup b/install.sh
similarity index 72%
rename from setup
rename to install.sh
index 5b67141..402b85c 100644
--- a/setup
+++ b/install.sh
@@ -1,25 +1,26 @@
 #!/bin/bash
 
-set -e
-
-#
-# Detects the current shell (bash, zsh, ...) and adds, if necessary, a managed
-# block to its configuration to source extra files on shell-start.
+# 1. PRECONDITIONS
 #
+# zsh is expected to be set up.
 
-BLOCK_DELIMITER_PATTERN="mcataford/env-managed-block"
-WORKING_PATH=$(git rev-parse --show-toplevel)
-SHELL_CONFIG_PATH=""
-
-# First, we need to know if we're dealing with ZSH or Bash.
-if [[ -n $(echo $SHELL | grep zsh) ]]; then
-    SHELL_CONFIG_PATH="$HOME/.zshrc"
-else
-    SHELL_CONFIG_PATH="$HOME/.bashrc"
+if [ -z "$(zshc --version 2> /dev/null)" ]; then
+    echo "💥 Install zsh (https://www.zsh.org/) before installing environment."
+    return
 fi
 
-# A managed block is added to source the `shell_extras` file
-# in the shell configuration (either `.zshrc` or `.bashrc`).
+# 2. CONFIGURATION INJECTION
+
+# 2.1 Inject shell configuration.
+#
+# Adds a managed block to the shell configuration to 
+# source extra files on shell-start.
+#
+
+BLOCK_DELIMITER_PATTERN="mcataford/env"
+WORKING_PATH=$(git rev-parse --show-toplevel)
+SHELL_CONFIG_PATH="$HOME/.zshrc"
+
 echo "Setting up shell configuration extras..."
 if [[ -z $(cat $SHELL_CONFIG_PATH | grep $BLOCK_DELIMITER_PATTERN) ]]; then
     echo "# $BLOCK_DELIMITER_PATTERN\:start
@@ -33,8 +34,12 @@ fi
 EDITOR_CONFIG=$HOME/.config/nvim
 EDITOR_CONFIG_FILE=$EDITOR_CONFIG/init.vim
 
+# 2.2 Inject nvim configuration.
+#
 # Similarly, sourcing for `extras.vim` is added to the vim configuration
 # so plugins, bindings and whatnot are loaded on start.
+#
+
 if [[ -f $EDITOR_CONFIG_FILE ]]; then
     echo "Setting up NVIM configuration extras..."
     if [[ -z $(cat $EDITOR_CONFIG_FILE | grep $BLOCK_DELIMITER_PATTERN) ]]; then