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 9ae6d36c5f6..a0a043ccb35 100644
--- a/tensorflow/core/api_def/base_api/api_def_Acosh.pbtxt
+++ b/tensorflow/core/api_def/base_api/api_def_Acosh.pbtxt
@@ -3,7 +3,8 @@ 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, inf)`. 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
 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]