diff --git a/README.md b/README.md
index 796bf0c..8dc7726 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,15 @@
 # flake
 Very simple snowflake generator
 
+but..
+
+Why is the mutex'd version faster?
+
+```
+go test -bench=.
+testing: warning: no tests to run
+PASS
+BenchmarkGenerate-12                     3000000               523 ns/op               0 B/op          0 allocs/op
+BenchmarkGenerateLocks-12                5000000               290 ns/op               0 B/op          0 allocs/op
+BenchmarkGenerateLocksParallel-12        3000000               540 ns/op               0 B/op          0 allocs/op
+```