diff --git a/libc/utils/MPFRWrapper/MPFRUtils.h b/libc/utils/MPFRWrapper/MPFRUtils.h
@@ -25,6 +25,7 @@ enum class Operation : int {
   // and output floating point numbers are of the same kind.
   BeginUnaryOperationsSingleOutput,
   Abs,
+  Atanh,
   Ceil,
   Cos,
   Cosh,
-Original file line number
+Diff line change
@@ Expand Up / @@ -25,6 +25,7 @@ enum class Operation : int { @@
       // and output floating point numbers are of the same kind.
       BeginUnaryOperationsSingleOutput,
       Abs,
+      Atanh,
       Ceil,
       Cos,
       Cosh,
@@ Expand Down @@