diff --git a/requirements.txt b/requirements.txt
index 8a4f2d2..b659564 100755
--- a/requirements.txt
+++ b/requirements.txt
@@ -13,3 +13,5 @@ cryptography
 markdown
 pdfkit
 gTTS>=2.3.1
+# Dependencias del sistema (instalar con apt/dnf/apk, NO con pip):
+# ffmpeg - Requerido por TTS para convertir MP3 a WAV (apt install ffmpeg)