diff --git a/rsrcfork/__main__.py b/rsrcfork/__main__.py
index 0af37b4..24e1a31 100644
--- a/rsrcfork/__main__.py
+++ b/rsrcfork/__main__.py
@@ -199,9 +199,9 @@ def _describe_resource(res: api.Resource, *, include_type: bool, decompress: boo
 		try:
 			res.compressed_info
 		except compress.DecompressError:
-			length_desc = f"decompression failed ({res.length_raw} bytes compressed)"
+			length_desc = f"unparseable compressed data header ({res.length_raw} bytes compressed)"
 		else:
-			length_desc = f"{res.length} bytes ({res.length_raw} bytes compressed)"
+			length_desc = f"{res.length} bytes ({res.length_raw} bytes compressed, 'dcmp' ({res.compressed_info.dcmp_id}) format)"
 	else:
 		length_desc = f"{res.length_raw} bytes"
 	content_desc_parts.append(length_desc)