diff --git a/paddle/fluid/operators/activation_op.cc b/paddle/fluid/operators/activation_op.cc
index e3dff735c6087010842dbb7fa8d9eb7c8f68e496..f086a4cc46e23521ddaa7f21394653ec89903b49 100644
--- a/paddle/fluid/operators/activation_op.cc
+++ b/paddle/fluid/operators/activation_op.cc
@@ -337,7 +337,7 @@ class AcosOpMaker : public framework::OpProtoAndCheckerMaker {
     AddInput("X", "Input of acos operator");
     AddOutput("Out", "Output of acos operator");
     AddComment(R"DOC(
-Arccosine Activation Operator.
+Arccosine Operator.
 
 $$out = \cos^{-1}(x)$$