diff --git a/gtfs-realtime/proto/gtfs-realtime.proto b/gtfs-realtime/proto/gtfs-realtime.proto
index bd7d02ab4..4c2dc70ac 100644
--- a/gtfs-realtime/proto/gtfs-realtime.proto
+++ b/gtfs-realtime/proto/gtfs-realtime.proto
@@ -470,11 +470,9 @@ message Alert {
   optional TranslatedString description_text = 11;
 
   // Text for alert header to be used in text-to-speech implementations. This field is the text-to-speech version of header_text.
-  // This field is still experimental, and subject to change. It may be formally adopted in the future.
   optional TranslatedString tts_header_text = 12;
 
   // Text for full description for the alert to be used in text-to-speech implementations. This field is the text-to-speech version of description_text.
-  // This field is still experimental, and subject to change. It may be formally adopted in the future.
   optional TranslatedString tts_description_text = 13;
 
   // Severity of this alert.
diff --git a/gtfs-realtime/spec/en/reference.md b/gtfs-realtime/spec/en/reference.md
index 8f34d290c..b4da2331c 100644
--- a/gtfs-realtime/spec/en/reference.md
+++ b/gtfs-realtime/spec/en/reference.md
@@ -273,8 +273,8 @@ An alert, indicating some sort of incident in the public transit network.
 | **url** | [TranslatedString](#message-translatedstring) | Optional | One | The URL which provides additional information about the alert. |
 | **header_text** | [TranslatedString](#message-translatedstring) | Required | One | Header for the alert. This plain-text string will be highlighted, for example in boldface. |
 | **description_text** | [TranslatedString](#message-translatedstring) | Required | One | Description for the alert. This plain-text string will be formatted as the body of the alert (or shown on an explicit "expand" request by the user). The information in the description should add to the information of the header. |
-| **tts_header_text** | [TranslatedString](#message-translatedstring) | Optional | One | Text containing the alert's header to be used for text-to-speech implementations. This field is the text-to-speech version of header_text. It should contain the same information as header_text but formatted such that it can read as text-to-speech (for example, abbreviations removed, numbers spelled out, etc.) **Caution:** this field is still **experimental**, and subject to change. It may be formally adopted in the future. |
-| **tts_description_text** | [TranslatedString](#message-translatedstring) | Optional | One | Text containing a description for the alert to be used for text-to-speech implementations. This field is the text-to-speech version of description_text. It should contain the same information as description_text but formatted such that it can be read as text-to-speech (for example, abbreviations removed, numbers spelled out, etc.) **Caution:** this field is still **experimental**, and subject to change. It may be formally adopted in the future. |
+| **tts_header_text** | [TranslatedString](#message-translatedstring) | Optional | One | Text containing the alert's header to be used for text-to-speech implementations. This field is the text-to-speech version of header_text. It should contain the same information as header_text but formatted such that it can read as text-to-speech (for example, abbreviations removed, numbers spelled out, etc.) |
+| **tts_description_text** | [TranslatedString](#message-translatedstring) | Optional | One | Text containing a description for the alert to be used for text-to-speech implementations. This field is the text-to-speech version of description_text. It should contain the same information as description_text but formatted such that it can be read as text-to-speech (for example, abbreviations removed, numbers spelled out, etc.) |
 | **severity_level** | [SeverityLevel](#enum-severitylevel) | Optional | One | Severity of the alert. |
 
 ## _enum_ Cause