diff --git a/tianshou/optimizer/README.md b/tianshou/optimizer/README.md
index 1b39f0d..31775ae 100644
--- a/tianshou/optimizer/README.md
+++ b/tianshou/optimizer/README.md
@@ -8,4 +8,4 @@ PPO
 GAE
 NAF
 DPG
-ACKTR
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+ACKTR 
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