diff --git a/README b/README
index 635966d..856e2a8 100644
--- a/README
+++ b/README
@@ -1,4 +1,5 @@
-simple libc tests based on the libc-testsuit of dalias
+simple libc tests based on the libc-testsuit
+and libc-bench of dalias
 see http://git.etalabs.net/cgi-bin/gitweb.cgi
 
 build tests:
@@ -7,6 +8,8 @@ build tests:
 	make
 run tests:
 	./t
+run benchmarks:
+	./b
 
 about the framework:
 
@@ -14,6 +17,9 @@ the only hook in the test framework is error(...) which
 prints a formatted message and sets the test to failed
 see common/test.h
 
+benchmark functions are repeatedly called with increasing
+N until runing time is long enough, then time/N is printed
+
 in the root dir make builds an executable with all tests
 in a src/* dir make builds only local tests
 see Makefile.inc
@@ -28,4 +34,5 @@ test functions
 see Makefile.inc
 
 edit the generated main.h to exclude certain tests
-see common/main.c
+see common/t.c for tests
+see common/b.c for benchmarks