diff --git a/doc/fluid/howto/performance/profiler.md b/doc/fluid/howto/performance/profiler.md
index ee96e7c74ce317caddb387cbb1d4998937bd5c81..1a5b8939a150d0a88861e26c20e5fd015d63c88f 100644
--- a/doc/fluid/howto/performance/profiler.md
+++ b/doc/fluid/howto/performance/profiler.md
@@ -23,7 +23,7 @@ But how to record the time for the mixed C++ and CUDA program? There many C++ A
The overall flow is shown as the following figure.
-
+
### Event