README.md: complexity lambda takes int64_t arg. Fixes #719

1 files changed, 1 insertions, 1 deletions

diff --git a/README.md b/README.md
index 360a18d..e4d5bf1 100644
--- a/README.md
+++ b/README.md
@@ -255,7 +255,7 @@ that might be used to customize high-order term calculation.
 
 ```c++
 BENCHMARK(BM_StringCompare)->RangeMultiplier(2)
-    ->Range(1<<10, 1<<18)->Complexity([](int n)->double{return n; });
+    ->Range(1<<10, 1<<18)->Complexity([](int64_t n)->double{return n; });
 ```
 
 ### Templated benchmarks