diff --git a/Source/Modules/IMEModules/mgrPrefs.swift b/Source/Modules/IMEModules/mgrPrefs.swift
index 1a38a935..bf345dd5 100644
--- a/Source/Modules/IMEModules/mgrPrefs.swift
+++ b/Source/Modules/IMEModules/mgrPrefs.swift
@@ -53,6 +53,7 @@ struct UserDef {
   static let kUseSCPCTypingMode = "UseSCPCTypingMode"
   static let kMaxCandidateLength = "MaxCandidateLength"
   static let kShouldNotFartInLieuOfBeep = "ShouldNotFartInLieuOfBeep"
+  static let kShowHanyuPinyinInCompositionBuffer = "ShowHanyuPinyinInCompositionBuffer"
 
   static let kCandidateTextFontName = "CandidateTextFontName"
   static let kCandidateKeyLabelFontName = "CandidateKeyLabelFontName"
@@ -230,6 +231,7 @@ public class mgrPrefs: NSObject {
       UserDef.kUseSCPCTypingMode,
       UserDef.kMaxCandidateLength,
       UserDef.kShouldNotFartInLieuOfBeep,
+      UserDef.kShowHanyuPinyinInCompositionBuffer,
       UserDef.kAssociatedPhrasesEnabled,
     ]
   }
@@ -273,6 +275,8 @@ public class mgrPrefs: NSObject {
     )
     UserDefaults.standard.setDefault(mgrPrefs.phraseReplacementEnabled, forKey: UserDef.kPhraseReplacementEnabled)
     UserDefaults.standard.setDefault(mgrPrefs.shouldNotFartInLieuOfBeep, forKey: UserDef.kShouldNotFartInLieuOfBeep)
+    UserDefaults.standard.setDefault(
+      mgrPrefs.showHanyuPinyinInCompositionBuffer, forKey: UserDef.kShowHanyuPinyinInCompositionBuffer)
 
     UserDefaults.standard.synchronize()
   }
@@ -352,6 +356,9 @@ public class mgrPrefs: NSObject {
   @UserDefault(key: UserDef.kShouldNotFartInLieuOfBeep, defaultValue: true)
   static var shouldNotFartInLieuOfBeep: Bool
 
+  @UserDefault(key: UserDef.kShowHanyuPinyinInCompositionBuffer, defaultValue: false)
+  static var showHanyuPinyinInCompositionBuffer: Bool
+
   static func toggleShouldNotFartInLieuOfBeep() -> Bool {
     shouldNotFartInLieuOfBeep = !shouldNotFartInLieuOfBeep
     UserDefaults.standard.set(shouldNotFartInLieuOfBeep, forKey: UserDef.kShouldNotFartInLieuOfBeep)