diff --git a/speech-to-text/v1.ts b/speech-to-text/v1.ts
index 8de9de1eac..d1d3e8950b 100644
--- a/speech-to-text/v1.ts
+++ b/speech-to-text/v1.ts
@@ -280,6 +280,7 @@ namespace SpeechToTextV1 {
     speechDetectorSensitivity?: number;
     backgroundAudioSuppression?: number;
     lowLatency?: boolean;
+    characterInsertionBias?: number;
   }
 }
 
diff --git a/text-to-speech/v1.ts b/text-to-speech/v1.ts
index f48d87cff3..2e5d49b203 100644
--- a/text-to-speech/v1.ts
+++ b/text-to-speech/v1.ts
@@ -149,6 +149,7 @@ namespace TextToSpeechV1 {
     watsonToken?: string;
     voice?: string;
     customizationId?: string;
+    spellOutMode?: string;
     xWatsonLearningOptOut?: boolean;
     xWatsonMetadata?: string;
   }