diff --git a/DeepDrftContent/CLAUDE.md b/DeepDrftContent/CLAUDE.md
index 80b3604..be31395 100644
--- a/DeepDrftContent/CLAUDE.md
+++ b/DeepDrftContent/CLAUDE.md
@@ -78,13 +78,15 @@ public async Task<bool> RegisterResourceAsync(string vaultId, string entryId, Fi
 
 `AudioProcessor.ProcessWavFileAsync(filePath)`:
 
-1. Validates the RIFF/WAVE/PCM structure.
-2. Parses the fmt and data chunks.
-3. Extracts duration (sample count / sample rate) and bitrate (file size / duration).
-4. Returns `AudioBinary` with all metadata.
-5. **Fallback**: If parsing fails, logs a warning and returns defaults (180s / 1411 kbps / 44.1 kHz / 16-bit stereo).
+1. Validates the RIFF/WAVE structure and format code.
+2. Accepts standard PCM (audioFormat=1) and WAVE_FORMAT_EXTENSIBLE (audioFormat=0xFFFE) when the SubFormat GUID indicates PCM.
+3. Normalizes EXTENSIBLE-PCM uploads to standard 44-byte PCM WAV before storing in the vault.
+4. Parses the fmt and data chunks.
+5. Extracts duration (sample count / sample rate) and bitrate (file size / duration).
+6. Returns `AudioBinary` with all metadata.
+7. **Fallback**: If parsing fails, logs a warning and returns defaults (180s / 1411 kbps / 44.1 kHz / 16-bit stereo).
 
-PCM-only today. Other formats (mp3, flac, aac, ogg, m4a) are listed in `MimeTypeExtensions` but not implemented. The processor validates RIFF/WAVE/PCM format — anything else is rejected.
+PCM-only (both standard and EXTENSIBLE variants). Other formats (mp3, flac, aac, ogg, m4a) are listed in `MimeTypeExtensions` but not implemented. EXTENSIBLE with non-PCM SubFormats are rejected. The processor validates RIFF/WAVE/PCM structure — anything else is rejected.
 
 ## Image processor