diff --git a/doc/v2/howto/optimization/pprof_1.png b/doc/fluid/howto/optimization/pprof_1.png similarity index 100% rename from doc/v2/howto/optimization/pprof_1.png rename to doc/fluid/howto/optimization/pprof_1.png diff --git a/doc/v2/howto/optimization/pprof_2.png b/doc/fluid/howto/optimization/pprof_2.png similarity index 100% rename from doc/v2/howto/optimization/pprof_2.png rename to doc/fluid/howto/optimization/pprof_2.png