diff --git a/README b/README
index d7e9389..fd5195b 100644
--- a/README
+++ b/README
@@ -4,6 +4,9 @@ mkproof is a small C program for generating proofs of work.
 
 				  Installation
 
+If mkproof is available as a package on your system, prefer to install that
+rather than build it yourself.
+
 mkproof depends only on a POSIX-like environment and a C99 compiler.
 
 	$ ./configure
@@ -53,3 +56,8 @@ which should be transmitted to the challenger.
 To verify the proof, simply run the proof algorithm with the original challenge
 parameters and the challengee's provided seed and verify that the resulting
 hexadecimal string is prefixed with the appropriate number of zeroes.
+
+				     Notes
+
+The defaults are tuned to take about ten minutes on one core of a modern
+consumer CPU.