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diff --git a/tensorflow/core/api_def/base_api/api_def_UniqueV2.pbtxt b/tensorflow/core/api_def/base_api/api_def_UniqueV2.pbtxt
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+op {
+  graph_op_name: "UniqueV2"
+  in_arg {
+    name: "x"
+    description: <<END
+A `Tensor`.
+END
+  }
+  in_arg {
+    name: "axis"
+    description: <<END
+A `Tensor` of type `int64` (default: 0). The axis of the Tensor to
+find the unique elements.
+END
+  }
+  out_arg {
+    name: "y"
+    description: <<END
+A `Tensor`. Unique elements along the `axis` of `Tensor` x.
+END
+  }
+  out_arg {
+    name: "idx"
+    description: <<END
+A 1-D Tensor. Has the same type as x that contains the index of each
+value of x in the output y.
+END
+  }
+  summary: "Finds unique elements in a 1-D tensor."
+  description: <<END
+This operation returns a tensor `y` containing all of the unique elements of `x`
+sorted in the same order that they occur in `x`. This operation also returns a
+tensor `idx` the same size as `x` that contains the index of each value of `x`
+in the unique output `y`. In other words:
+
+`y[idx[i]] = x[i] for i in [0, 1,...,rank(x) - 1]`
+
+For example:
+
+```
+# tensor 'x' is [1, 1, 2, 4, 4, 4, 7, 8, 8]
+y, idx = unique(x)
+y ==> [1, 2, 4, 7, 8]
+idx ==> [0, 0, 1, 2, 2, 2, 3, 4, 4]
+```
+END
+}