add missing comment

git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@2518 35c25a1d-7b9e-4130-9fde-d3aeb78583b8

src/utils.c

@@ -105,6 +105,8 @@ bool parse_num(const char *str, ssize_t *val)
     return TRUE;
 }
 
+/* Read an int and a ssize_t, separated by a comma, from str, and store
+ * them in *line and *column (if they're not both NULL). */
 void parse_line_column(const char *str, int *line, ssize_t *column)
 {
     char *comma;