diff --git a/Filer-Benchmark.md b/Filer-Benchmark.md
index e69eb85..ad99c08 100644
--- a/Filer-Benchmark.md
+++ b/Filer-Benchmark.md
@@ -10,7 +10,7 @@ But after digging deeper into it, I found the S3 is poorly implemented and not m
 What is more, the API cost is a big concern. S3 seems cheap for storage, but for small objects which requires frequent access, the API cost can quickly add up at $0.005 for 1 thousand PUT/DELETE requests.
 
 If we need to test with 1 million objects:
-  * 1 million write operations cost $5, or $150/month for 12 operations/second. 
+  * 1 million write operations cost $5, or $150/month for 12 operations/second in production.
   * Another $5 to clean up the 1 million test objects.
 
 So not only it is fairly slow, but also it is expensive to use S3 as a key-value store.