diff --git a/blow.el b/blow.el
index 15cfd75956..974f745d6b 100644
--- a/blow.el
+++ b/blow.el
@@ -93,7 +93,7 @@
 
 (defun blow--set-mode-list (symbol value)
   "Set SYMBOL's default value to VALUE, SYMBOL should be `blow-mode-list'."
-  (set-default symbol value)
+  (set-default symbol value)		;perhaps `custom-set-default' would be better?
   (when blow-mode
     (blow--setup-all-buffers)))
 
@@ -111,12 +111,12 @@ Don't modify this variable from Lisp programs, use `blow' instead."
                        (sexp :tag "Mode line template")))
   :set #'blow--set-mode-list)
 
-(defvar blow--original-lighters nil
+(defvar blow--original-lighters nil	;why isn't the value initialised?
   "Hash table of modes and their original lighters or nil.")
 
 (defun blow--hash-exists-p (key table)
   "Return t if KEY is in hash table TABLE."
-  (let ((default (make-symbol "blow--nonexistant")))
+  (let ((default (make-symbol "blow--nonexistant"))) ;the prefix is not necessary, the symbol isn't interned anyway
     (not (eq (gethash key table default) default))))
 
 (defun blow--puthash-unless-exists (key value table)