X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=handy.h;h=76cbf2e2162e96207487671a6c27d16e6e4b7291;hb=645c22eff49f10f8bfaa5864a990561e60fea631;hp=99cb5c6e749b13b3540dce7b240cef3a136931ec;hpb=9041c2e396c8c7de7680a2007dc341a9f65be0d0;p=p5sagit%2Fp5-mst-13.2.git

diff --git a/handy.h b/handy.h
index 99cb5c6..76cbf2e 100644
--- a/handy.h
+++ b/handy.h
@@ -194,6 +194,7 @@ typedef U64TYPE U64;
 
 #endif
 
+/* log(2) is pretty close to  0.30103, just in case anyone is grepping for it */
 #define BIT_DIGITS(N)   (((N)*146)/485 + 1)  /* log2(10) =~ 146/485 */
 #define TYPE_DIGITS(T)  BIT_DIGITS(sizeof(T) * 8)
 #define TYPE_CHARS(T)   (TYPE_DIGITS(T) + 2) /* sign, NUL */