Document length limit on bitfield processing.

1 files changed, 4 insertions, 3 deletions

diff --git a/bits.c b/bits.c
index a45a3b7d..0757d3e6 100644
--- a/bits.c
+++ b/bits.c
@@ -1,8 +1,9 @@
 /* $Id$ */
 /*
- * Bitfield extraction functions.  In each, start is a bit index (not a byte
- * index) and width is a bit width (bounded above by the bit width of long 
- * long).
+ * Bitfield extraction functions.  In each, start is a bit index (not
+ * a byte index) and width is a bit width.  The width bounded above by
+ * the bit width of a long long, which s 64 bits in all standard data
+ * models for 64-bit processors.
  *
  * The sbits() function assumes twos-complement arithmetic.
  */