diff --git a/llvm/include/llvm/ADT/bit.h b/llvm/include/llvm/ADT/bit.h
--- a/llvm/include/llvm/ADT/bit.h
+++ b/llvm/include/llvm/ADT/bit.h
@@ -20,9 +20,8 @@
 
 namespace llvm {
 
-// This implementation of bit_cast is different from the C++17 one in two ways:
-//  - It isn't constexpr because that requires compiler support.
-//  - It requires trivially-constructible To, to avoid UB in the implementation.
+// This implementation of bit_cast is different from the C++20 one.
+// This version isn't constexpr because that requires compiler support.
 template <
     typename To, typename From,
     typename = std::enable_if_t<sizeof(To) == sizeof(From)>