diff --git a/README.md b/README.md
index 7d3af9f..ef0c711 100644
--- a/README.md
+++ b/README.md
@@ -66,7 +66,7 @@ Container images are configured using parameters passed at runtime (such as thos
 | `-e VIDEO_PROFILE=""` | Video profile |
 | `-e VIDEO_MAX_LEVEL="4.1"` | Maximum video level, videos above will be down sampled. Format example is 4.1 |
 | `-e VIDEO_PIX_FMT=""` | Supported pix-fmt list. Formats not on this list are be converted to the first format on the list |
-| `-e AUDIO_CODEC="libfdk_aac, aac, mp3, opus"` | Approved audio codecs. Codecs not on this list are converted to the first codec on the list |
+| `-e AUDIO_CODEC="ac3, eac3, aac, mp3, opus"` | Approved audio codecs. Codecs not on this list are converted to the first codec on the list |
 | `-e AUDIO_LANGUAGES="eng"` | Approved audio stream languages. Languages not on this list will not be used. Leave blank to approve all languages |
 | `-e AUDIO_DEFAULT_LANGUAGE="eng"` | If audio stream language is undefined, assumed this language |
 | `-e AUDIO_FIRST_STREAM_OF_LANGUAGE="False"` | Only include the first occurrence of an audio stream of language |
@@ -80,7 +80,7 @@ Container images are configured using parameters passed at runtime (such as thos
 | `-e AUDIO_COPY_ORIGINAL="True"` | Always include a copy of the original audio stream |
 | `-e AUDIO_AAC_ADTSTOASC="False"` |  |
 | `-e AUDIO_IGNORE_TREHD="mp4, m4v"` | Ignore trueHD audio streams for specific extensions (Not supported in MP4 containers). Leave blank to disable |
-| `-e UAUDIO_CODEC=""libfdk_aac, aac, mp3"` | Approved audio codecs. Codecs not on this list are converted to the first codec on the list |
+| `-e UAUDIO_CODEC="aac, mp3"` | Approved audio codecs. Codecs not on this list are converted to the first codec on the list |
 | `-e UAUDIO_CHANNEL_BITRATE="80"` |  Bitrate of universal audio stream per channel. Multiple by number of channels to get stream bitrate. Use 0 to attempt to guess based on source bitrate |
 | `-e UAUDIO_FIRST_STREAM_ONLY="True"` | Only create a universal audio stream for the first audio stream encountered |
 | `-e UAUDIO_MOVE_AFTER="True"` | Move universal audio stream after the source stream |