diff --git a/tools/transcription_tools.py b/tools/transcription_tools.py
index 0c0a1fc9f..70791b0ca 100644
--- a/tools/transcription_tools.py
+++ b/tools/transcription_tools.py
@@ -12,7 +12,7 @@ Provides speech-to-text transcription with three providers:
 Used by the messaging gateway to automatically transcribe voice messages
 sent by users on Telegram, Discord, WhatsApp, Slack, and Signal.
 
-Supported input formats: mp3, mp4, mpeg, mpga, m4a, wav, webm, ogg
+Supported input formats: mp3, mp4, mpeg, mpga, m4a, wav, webm, ogg, aac
 
 Usage::
 
@@ -60,7 +60,7 @@ COMMON_LOCAL_BIN_DIRS = ("/opt/homebrew/bin", "/usr/local/bin")
 GROQ_BASE_URL = os.getenv("GROQ_BASE_URL", "https://api.groq.com/openai/v1")
 OPENAI_BASE_URL = os.getenv("STT_OPENAI_BASE_URL", "https://api.openai.com/v1")
 
-SUPPORTED_FORMATS = {".mp3", ".mp4", ".mpeg", ".mpga", ".m4a", ".wav", ".webm", ".ogg"}
+SUPPORTED_FORMATS = {".mp3", ".mp4", ".mpeg", ".mpga", ".m4a", ".wav", ".webm", ".ogg", ".aac"}
 LOCAL_NATIVE_AUDIO_FORMATS = {".wav", ".aiff", ".aif"}
 MAX_FILE_SIZE = 25 * 1024 * 1024  # 25 MB