diff --git a/prompt.zsh b/prompt.zsh
index 64317e8..229c76b 100644
--- a/prompt.zsh
+++ b/prompt.zsh
@@ -1,11 +1,11 @@
 # Pure
 # by Sindre Sorhus
-# https://github.com/sindresorhus/pure/
+# https://github.com/sindresorhus/pure
 # MIT License
 
 
 # Change this to your own username
-local default_username='sindresorhus'
+DEFAULT_USERNAME='sindresorhus'
 
 # Threshold (sec) for showing cmd exec time
 CMD_MAX_EXEC_TIME=5
@@ -30,7 +30,7 @@ zstyle ':vcs_info:git*' formats ' %b'
 zstyle ':vcs_info:git*' actionformats ' %b|%a'
 
 # Only show username if not default
-[ $USER != $default_username ] && local username='%n@%m '
+[ $USER != $DEFAULT_USERNAME ] && local username='%n@%m '
 
 # Fastest possible way to check if repo is dirty
 git_dirty() {
@@ -51,13 +51,13 @@ preexec() {
 
 precmd() {
 	vcs_info
-	# Add `%*` to show the time
+	# Add `%*` to display the time
 	print -P '\n%F{blue}%~%F{236}$vcs_info_msg_0_`git_dirty` $username%f %F{yellow}`cmd_exec_time`%f'
 	# Reset value since `preexec` isn't always triggered
 	unset cmd_timestamp
 }
 
-# Turns the prompt red if the last command exited with 0
+# Prompt turns red if the previous command didn't exit with 0
 PROMPT='%(?.%F{magenta}.%F{red})❯%f '
 # Can be disabled:
 # PROMPT='%F{magenta}❯%f '
diff --git a/readme.md b/readme.md
index ded0bbf..5139886 100644
--- a/readme.md
+++ b/readme.md
@@ -23,7 +23,7 @@ Most prompts are cluttered, ugly and slow. I wanted something visually pleasing
 
 - Download `prompt.zsh` or submodule this repo
 - In your `.zshrc` add `. path/to/prompt.zsh`
-- Add your username to the `default_username` variable
+- Add your username to `DEFAULT_USERNAME`
 
 
 ## Tip