diff --git a/environment.zsh b/environment.zsh
index caa97a3..641857c 100644
--- a/environment.zsh
+++ b/environment.zsh
@@ -10,8 +10,9 @@ autoload -Uz url-quote-magic
 zle -N self-insert url-quote-magic
 
 # General
+setopt BRACE_CCL          # Allow brace character class list expansion.
 setopt RC_QUOTES          # Allow 'Henry''s Garage' instead of 'Henry'\''s Garage'.
-unsetopt MAIL_WARNING     # Don't print a warning message if a mail file has been accessed
+unsetopt MAIL_WARNING     # Don't print a warning message if a mail file has been accessed.
 
 # Jobs
 setopt LONG_LIST_JOBS     # List jobs in the long format by default.