tweak comments

diff --git a/lib/mbswidth.h b/lib/mbswidth.h
index f76021b..b28a9ba 100644 (file)
--- a/lib/mbswidth.h
+++ b/lib/mbswidth.h
@@ -25,12 +25,12 @@
 
 /* Optional flags to influence mbswidth/mbsnwidth behavior.  */
 
-/* Assume invalid characters have width 0.  If this is not set, the
-   functions return -1 if an invalid or incomplete character occurs.  */
-#define MBSW_ACCEPT_INVALID            1
+/* Assume invalid characters have width 0.  If this is zero, the
+   functions return -1 if they find an invalid or incomplete character.  */
+#define MBSW_ACCEPT_INVALID 1
 
-/* Assume unprintable characters have width 1.  If this is not set, the
-   functions return -1 if a non-printable character occurs.  */
+/* Assume unprintable characters have width 1.  If this is zero, the
+   functions return -1 if they find a non-printable character.  */
 #define MBSW_ACCEPT_UNPRINTABLE        2
 
 /* Returns the number of screen columns needed for STRING.  */