diff --git a/qse/lib/awk/misc.c b/qse/lib/awk/misc.c
index 68b23070..851c2b05 100644
--- a/qse/lib/awk/misc.c
+++ b/qse/lib/awk/misc.c
@@ -1182,11 +1182,10 @@ int qse_awk_buildrex (
 
 	if (code) *code = tre;
 	if (icode) *icode = itre;
-	return 0;	
+	return 0;
 #endif
 }
 
-
 #if !defined(USE_REX)
 
 static int matchtre (
diff --git a/qse/lib/awk/parse.c b/qse/lib/awk/parse.c
index 1b0968b3..ec1c6062 100644
--- a/qse/lib/awk/parse.c
+++ b/qse/lib/awk/parse.c
@@ -5691,14 +5691,15 @@ static int get_rexstr (qse_awk_t* awk, qse_awk_tok_t* tok)
 {
 	if (awk->sio.last.c == QSE_T('/')) 
 	{
-		/* this part of the function is different from get_charstr
-		 * because of the way this function is called. 
+		/* handle an empty regular expression.
+		 *
 		 * this condition is met when the input is //.
 		 * the first / has been tokenized to TOK_DIV already.
 		 * if TOK_DIV is seen as a primary, this function is called.
 		 * as the token buffer has been cleared by the caller and
 		 * the token type is set to TOK_REX, this function can
-		 * just return after reading the next character */
+		 * just return after reading the next character.
+		 * see parse_primary_rex(). */
 		GET_CHAR (awk);
 		return 0;
 	}