--- Digest-Hashcash/README	2003/09/06 22:12:00	1.1
+++ Digest-Hashcash/README	2003/09/11 06:20:26	1.2
@@ -13,9 +13,29 @@
     both in your compiler and your standard library. If you don't have a
     compiler that supports ISO C, get gcc at http://gcc.gnu.org/ :)
 
+    $secs = estimate_time $size
+        Estimate the average time necessary to calculate a token of the
+        given size.
+
+        See also "estimate_size".
+
+    $size = estimate_size $time[, $min]
+        Estimate the size that can be calculated in the given time (which is
+        an upper bound). The function will not return a size less then
+        "min".
+
+        Estimating the time to be used can go wrong by as much as 50% (but
+        is usually quite accurate), and the estimation itself can take as
+        much as a second on slower (<pentium) machines, but faster machines
+        (1Ghz P3 for example) usually handle it within a hundredth of a
+        second or so.
+
+        The estimation will be done only once, so you can call this fucntion
+        as often as you like without incuring the overhead everytime.
+
     $cipher = new [param => value...]
 
-        size => 20 + some
+        size => 18
             The number of collisions, in bits. Every bit increases the time
             to create the token (and thus the cash) by two.