diff --git a/src/fileformat.proto b/src/fileformat.proto
index 518e1bb..9e9b9bb 100644
--- a/src/fileformat.proto
+++ b/src/fileformat.proto
@@ -39,7 +39,7 @@ message Blob {
   // Possible compressed versions of the data.
   optional bytes zlib_data = 3;
 
-  // PROPOSED feature for LZMA compressed data. SUPPORT IS NOT REQUIRED.
+  // For LZMA compressed data (optional)
   optional bytes lzma_data = 4;
 
   // Formerly used for bzip2 compressed data. Deprecated in 2010.