diff --git a/LanguageBaseEnglish.xml b/LanguageBaseEnglish.xml
index b7a0591e3..ac88c29c2 100644
--- a/LanguageBaseEnglish.xml
+++ b/LanguageBaseEnglish.xml
@@ -3188,6 +3188,8 @@ Continue?</RestoreDefaultSettingsMsg>
     <AutoContinue>Auto-continue</AutoContinue>
     <Regenerate>Regenerate</Regenerate>
     <Speed>Speed</Speed>
+    <Stability>Stability</Stability>
+    <Similarity>Similarity</Similarity>
   </TextToSpeech>
   <TimedTextSmpteTiming>
     <Title>SMPTE timing</Title>
diff --git a/src/ui/Forms/Tts/TextToSpeech.cs b/src/ui/Forms/Tts/TextToSpeech.cs
index 44e98ea78..ae71818e2 100644
--- a/src/ui/Forms/Tts/TextToSpeech.cs
+++ b/src/ui/Forms/Tts/TextToSpeech.cs
@@ -126,6 +126,8 @@ namespace Nikse.SubtitleEdit.Forms.Tts
             checkBoxAudioEncoding.Text = LanguageSettings.Current.TextToSpeech.CustomAudioEncoding;
             linkLabelCustomAudio.Text = LanguageSettings.Current.Settings.Title;
             linkLabelCustomAudio.Left = checkBoxAudioEncoding.Right;
+            labelStability.Text = LanguageSettings.Current.TextToSpeech.Stability;
+            labelSimilarity.Text = LanguageSettings.Current.TextToSpeech.Similarity;
             buttonOK.Text = LanguageSettings.Current.General.Ok;
             buttonCancel.Text = LanguageSettings.Current.General.Cancel;
             UiUtil.FixLargeFonts(this, buttonOK);
diff --git a/src/ui/Logic/Language.cs b/src/ui/Logic/Language.cs
index 064db57d3..9935e9979 100644
--- a/src/ui/Logic/Language.cs
+++ b/src/ui/Logic/Language.cs
@@ -3586,6 +3586,8 @@ can edit in same subtitle file (collaboration)",
                 Play = "Play",
                 Regenerate = "Regenerate",
                 Speed = "Speed",
+                Stability = "Stability",
+                Similarity = "Similarity",
             };
 
             TimedTextSmpteTiming = new LanguageStructure.TimedTextSmpteTiming
diff --git a/src/ui/Logic/LanguageDeserializer.cs b/src/ui/Logic/LanguageDeserializer.cs
index 5362b4996..2b26435d2 100644
--- a/src/ui/Logic/LanguageDeserializer.cs
+++ b/src/ui/Logic/LanguageDeserializer.cs
@@ -8746,6 +8746,12 @@ namespace Nikse.SubtitleEdit.Logic
                 case "TextToSpeech/Speed":
                     language.TextToSpeech.Speed = reader.Value;
                     break;
+                case "TextToSpeech/Stability":
+                    language.TextToSpeech.Stability = reader.Value;
+                    break;
+                case "TextToSpeech/Similarity":
+                    language.TextToSpeech.Similarity = reader.Value;
+                    break;
                 case "TimedTextSmpteTiming/Title":
                     language.TimedTextSmpteTiming.Title = reader.Value;
                     break;
diff --git a/src/ui/Logic/LanguageStructure.cs b/src/ui/Logic/LanguageStructure.cs
index 080c9c420..f3982b0cd 100644
--- a/src/ui/Logic/LanguageStructure.cs
+++ b/src/ui/Logic/LanguageStructure.cs
@@ -3397,6 +3397,8 @@
             public string AutoContinue { get; set; }
             public string Regenerate { get; set; }
             public string Speed { get; set; }
+            public string Stability { get; set; }
+            public string Similarity { get; set; }
         }
 
         public class TimedTextSmpteTiming