diff --git a/Packages/vChewing_Shared/Sources/Shared/Protocols/IMEStateProtocol.swift b/Packages/vChewing_Shared/Sources/Shared/Protocols/IMEStateProtocol.swift
index ba4ed5dd..5825b639 100644
--- a/Packages/vChewing_Shared/Sources/Shared/Protocols/IMEStateProtocol.swift
+++ b/Packages/vChewing_Shared/Sources/Shared/Protocols/IMEStateProtocol.swift
@@ -22,6 +22,7 @@ public protocol IMEStateProtocol {
   var displayedTextConverted: String { get }
   var textToCommit: String { get set }
   var tooltip: String { get set }
+  var tooltipDuration: Double { get set }
   var attributedString: NSAttributedString { get }
   var convertedToInputting: IMEStateProtocol { get }
   var isFilterable: Bool { get }
@@ -53,6 +54,7 @@ public protocol IMEStateDataProtocol {
   var displayedTextConverted: String { get }
   var tooltipBackupForInputting: String { get set }
   var tooltip: String { get set }
+  var tooltipDuration: Double { get set }
   var attributedStringNormal: NSAttributedString { get }
   var attributedStringMarking: NSAttributedString { get }
   var attributedStringPlaceholder: NSAttributedString { get }
diff --git a/Source/Modules/IMEState.swift b/Source/Modules/IMEState.swift
index 289cc483..f9cbfa51 100644
--- a/Source/Modules/IMEState.swift
+++ b/Source/Modules/IMEState.swift
@@ -225,4 +225,9 @@ extension IMEState {
     get { data.tooltipBackupForInputting }
     set { data.tooltipBackupForInputting = newValue }
   }
+
+  public var tooltipDuration: Double {
+    get { type == .ofMarking ? 0 : data.tooltipDuration }
+    set { data.tooltipDuration = newValue }
+  }
 }
diff --git a/Source/Modules/IMEStateData.swift b/Source/Modules/IMEStateData.swift
index ea4279dd..31a85948 100644
--- a/Source/Modules/IMEStateData.swift
+++ b/Source/Modules/IMEStateData.swift
@@ -94,6 +94,7 @@ public struct IMEStateData: IMEStateDataProtocol {
   public var candidates = [(String, String)]()
   public var textToCommit: String = ""
   public var tooltip: String = ""
+  public var tooltipDuration: Double = 1.0
   public var tooltipBackupForInputting: String = ""
   public var attributedStringPlaceholder: NSAttributedString = .init(
     string: " ",