diff --git a/llvm/include/llvm/Object/ObjCopy/COFF/COFFObjcopy.h b/llvm/include/llvm/Object/ObjCopy/COFF/COFFObjcopy.h
--- a/llvm/include/llvm/Object/ObjCopy/COFF/COFFObjcopy.h
+++ b/llvm/include/llvm/Object/ObjCopy/COFF/COFFObjcopy.h
@@ -23,6 +23,9 @@
 
 namespace coff {
 
+/// Applies the transformations described by \p Config and \p COFFConfig
+/// to \p In and writes the result into \p Out.
+/// \returns any Error encountered whilst performing the operation.
 Error executeObjcopyOnBinary(const CommonConfig &Config, const COFFConfig &,
                              object::COFFObjectFile &In, raw_ostream &Out);
 
diff --git a/llvm/include/llvm/Object/ObjCopy/ELF/ELFObjcopy.h b/llvm/include/llvm/Object/ObjCopy/ELF/ELFObjcopy.h
--- a/llvm/include/llvm/Object/ObjCopy/ELF/ELFObjcopy.h
+++ b/llvm/include/llvm/Object/ObjCopy/ELF/ELFObjcopy.h
@@ -23,14 +23,25 @@
 struct ELFConfig;
 
 namespace elf {
+/// Applies the transformations described by \p Config and \p ELFConfig to
+/// \p In, which must represent an IHex file, and writes the result
+/// into \p Out.
+/// \returns any Error encountered whilst performing the operation.
 Error executeObjcopyOnIHex(const CommonConfig &Config,
                            const ELFConfig &ELFConfig, MemoryBuffer &In,
                            raw_ostream &Out);
 
+/// Applies the transformations described by \p Config and \p ELFConfig to
+/// \p In, which is treated as a raw binary input, and writes the result
+/// into \p Out.
+/// \returns any Error encountered whilst performing the operation.
 Error executeObjcopyOnRawBinary(const CommonConfig &Config,
                                 const ELFConfig &ELFConfig, MemoryBuffer &In,
                                 raw_ostream &Out);
 
+/// Applies the transformations described by \p Config and \p ELFConfig to
+/// \p In and writes the result into \p Out.
+/// \returns any Error encountered whilst performing the operation.
 Error executeObjcopyOnBinary(const CommonConfig &Config,
                              const ELFConfig &ELFConfig,
                              object::ELFObjectFileBase &In, raw_ostream &Out);
diff --git a/llvm/include/llvm/Object/ObjCopy/MachO/MachOObjcopy.h b/llvm/include/llvm/Object/ObjCopy/MachO/MachOObjcopy.h
--- a/llvm/include/llvm/Object/ObjCopy/MachO/MachOObjcopy.h
+++ b/llvm/include/llvm/Object/ObjCopy/MachO/MachOObjcopy.h
@@ -24,10 +24,16 @@
 class MultiFormatConfig;
 
 namespace macho {
+/// Applies the transformations described by \p Config and \p MachOConfig to
+/// \p In and writes the result into \p Out.
+/// \returns any Error encountered whilst performing the operation.
 Error executeObjcopyOnBinary(const CommonConfig &Config,
                              const MachOConfig &MachOConfig,
                              object::MachOObjectFile &In, raw_ostream &Out);
 
+/// Applies the transformations described by \p Config and \p MachOConfig to
+/// \p In and writes the result into \p Out.
+/// \returns any Error encountered whilst performing the operation.
 Error executeObjcopyOnMachOUniversalBinary(
     const MultiFormatConfig &Config, const object::MachOUniversalBinary &In,
     raw_ostream &Out);
diff --git a/llvm/include/llvm/Object/ObjCopy/wasm/WasmObjcopy.h b/llvm/include/llvm/Object/ObjCopy/wasm/WasmObjcopy.h
--- a/llvm/include/llvm/Object/ObjCopy/wasm/WasmObjcopy.h
+++ b/llvm/include/llvm/Object/ObjCopy/wasm/WasmObjcopy.h
@@ -22,6 +22,9 @@
 struct WasmConfig;
 
 namespace wasm {
+/// Applies the transformations described by \p Config and \p WasmConfig
+/// to \p In and writes the result into \p Out.
+/// \returns any Error encountered whilst performing the operation.
 Error executeObjcopyOnBinary(const CommonConfig &Config, const WasmConfig &,
                              object::WasmObjectFile &In, raw_ostream &Out);