diff --git a/src/appendices/media-files.md b/src/appendices/media-files.md
index 62759f3dfb..8dd47fc364 100644
--- a/src/appendices/media-files.md
+++ b/src/appendices/media-files.md
@@ -33,7 +33,7 @@ suffix with appropriate migration tooling
 
 ### Audio formats
 
-{{ MACROS___make_extension_table(["wav", "mp3", "aac", "ogg"]) }}
+{{ MACROS___make_extension_table(["wav", "flac", "mp3", "aac", "ogg"]) }}
 
 ### Video container formats
 
diff --git a/src/schema/objects/extensions.yaml b/src/schema/objects/extensions.yaml
index 26ce7a6eb0..7690412c3d 100644
--- a/src/schema/objects/extensions.yaml
+++ b/src/schema/objects/extensions.yaml
@@ -126,6 +126,11 @@ fif:
   display_name: Functional Imaging File Format
   description: |
     An MEG file format used by Neuromag, Elekta, and MEGIN.
+flac:
+  value: .flac
+  display_name: Free Lossless Audio Codec
+  description: |
+    A [FLAC](https://en.wikipedia.org/wiki/FLAC) lossless audio file.
 jpg:
   value: .jpg
   display_name: Joint Photographic Experts Group Format
diff --git a/src/schema/objects/metadata.yaml b/src/schema/objects/metadata.yaml
index 0122e0d2a0..f7af1cbb9b 100644
--- a/src/schema/objects/metadata.yaml
+++ b/src/schema/objects/metadata.yaml
@@ -237,6 +237,15 @@ AttenuationCorrectionMethodReference:
   description: |
     Reference paper for the attenuation correction method used.
   type: string
+AudioBitDepth:
+  name: AudioBitDepth
+  display_name: Audio Bit Depth
+  description: |
+    Number of bits per sample in the audio stream
+    (for example, `16`, `24`, or `32`).
+    Typically reported for uncompressed or losslessly compressed audio.
+  type: integer
+  minimum: 1
 AudioChannelCount:
   name: AudioChannelCount
   display_name: Audio Channel Count
diff --git a/src/schema/rules/sidecars/media.yaml b/src/schema/rules/sidecars/media.yaml
index 9e5dc25ed4..cf745dac45 100644
--- a/src/schema/rules/sidecars/media.yaml
+++ b/src/schema/rules/sidecars/media.yaml
@@ -16,6 +16,7 @@ MediaAudioProperties:
     AudioCodec: recommended
     AudioSampleRate: recommended
     AudioChannelCount: recommended
+    AudioBitDepth: optional
     AudioCodecRFC6381: optional
 
 MediaImageProperties: