diff --git a/EmulatorPkg/EmuGopDxe/GopInput.c b/EmulatorPkg/EmuGopDxe/GopInput.c
index a48293912d..94a4fcf267 100644
--- a/EmulatorPkg/EmuGopDxe/GopInput.c
+++ b/EmulatorPkg/EmuGopDxe/GopInput.c
@@ -156,6 +156,7 @@ EmuGopSimpleTextInReset (
   @retval EFI_NOT_READY    There was no keystroke data available.
   @retval EFI_DEVICE_ERROR The keystroke information was not returned due to
                            hardware errors.
+  @retval EFI_UNSUPPORTED  The device does not support the ability to read keystroke data.
 
 **/
 EFI_STATUS
@@ -339,6 +340,7 @@ EmuGopSimpleTextInExResetEx (
                           EFI_DEVICE_ERROR The keystroke
                           information was not returned due to
                           hardware errors.
+  @retval EFI_UNSUPPORTED The device does not support the ability to read keystroke data.
 
 
 **/