diff --git a/tensorflow/core/api_def/base_api/api_def_Acosh.pbtxt b/tensorflow/core/api_def/base_api/api_def_Acosh.pbtxt
index 01366662c80..9ae6d36c5f6 100644
--- a/tensorflow/core/api_def/base_api/api_def_Acosh.pbtxt
+++ b/tensorflow/core/api_def/base_api/api_def_Acosh.pbtxt
@@ -3,9 +3,10 @@ op {
   summary: "Computes inverse hyperbolic cosine of x element-wise."
   description: <<END
 Given an input tensor, the function computes inverse hyperbolic cosine of every element.
-Input range is [1, infinity). It returns `nan` if the input lies outside the range.
+Input range is `[1, inf)`. It returns `nan` if the input lies outside the range.
 ```python
-tensor `x` is [-2, -0.5, 1, 1.2, 200, 10000]
-tf.math.acosh(x) ==> [nan nan 0. 0.62236255 5.9914584 9.903487]
+x = tf.constant([-2, -0.5, 1, 1.2, 200, 10000, float("inf")])
+tf.math.acosh(x) ==> [nan nan 0. 0.62236255 5.9914584 9.903487 inf]
+```
 END
 }