diff --git a/lib/synth-audio.js b/lib/synth-audio.js
index d916af9..808a41a 100644
--- a/lib/synth-audio.js
+++ b/lib/synth-audio.js
@@ -174,6 +174,10 @@ async function synthAudio(client, createHash, retrieveHash, logger, stats, { acc
   let cached;
   if (!disableTtsCache) {
     cached = await client.get(key);
+    /**
+    *  If we are using tts streaming and also precaching audio, audio could have been cached by streaming (r8)
+    * or here in speech-utils due to precaching (mp3), so we need to check for both keys.
+    */
     if (!cached && JAMBONES_EAGERLY_PRE_CACHE_AUDIO) {
       const preCachekey = makeSynthKey({
         account_sid,