Update README.md

README.md

@@ -29,7 +29,7 @@ Just copy the files to your build tree and use a C++11 compiler
 
 Here are some [benchmarks](bench-comparison) comparing spdlog vs boost log(1.56.0) on Ubuntu 64 bits, Intel i7-4770 CPU @ 3.40GHz.
 
-The bench writes 1000,000 log lines to a rotating log file of size 10MB with 5 back rotated files.
+The bench writes 1000,000 log lines to a rotating log file using a shared logger object.
 
 #### spdlog vs. boost - single thread
 |library|log lines|threads|elapsed|