diff --git a/llvm/include/llvm/Support/Memory.h b/llvm/include/llvm/Support/Memory.h
index c0454223b2fd1f..31e0abbcdb61c9 100644
--- a/llvm/include/llvm/Support/Memory.h
+++ b/llvm/include/llvm/Support/Memory.h
@@ -14,7 +14,6 @@
 #define LLVM_SUPPORT_MEMORY_H
 
 #include "llvm/Support/DataTypes.h"
-#include <string>
 #include <system_error>
 
 namespace llvm {
@@ -116,7 +115,6 @@ namespace sys {
     /// memory was not allocated using the allocateMappedMemory method.
     /// \p Block describes the memory block to be protected.
     /// \p Flags specifies the new protection state to be assigned to the block.
-    /// \p ErrMsg [out] returns a string describing any error that occurred.
     ///
     /// If \p Flags is MF_WRITE, the actual behavior varies
     /// with the operating system (i.e. MF_READ | MF_WRITE on Windows) and the