Add lzma.{encode,decode}_filter_properties().
diff --git a/Lib/lzma.py b/Lib/lzma.py
index 3786993..5adf51f 100644
--- a/Lib/lzma.py
+++ b/Lib/lzma.py
@@ -19,6 +19,7 @@
 
     "LZMACompressor", "LZMADecompressor", "LZMAFile", "LZMAError",
     "compress", "decompress", "check_is_supported",
+    "encode_filter_properties", "decode_filter_properties",
 ]
 
 import io