diff --git a/Archive/README.md b/Archive/README.md
index daba48fc..974a1f7c 100644
--- a/Archive/README.md
+++ b/Archive/README.md
@@ -61,10 +61,17 @@ This will:
 
 ### `compress-archive.sh`
 
+Compress archived files.
+
 ```shell
 $ ./compress-archive.sh [FLAGS] PATH
 ```
 
+This is designed to selectively compress uncompressed raw files (Sony) achiving +/- 2x compression factor.
+
+By default this uses filesystem compression, supporting ntfs (on windows) and btrfs transparent native compression, but can be configured to use various archiving formats.
+
+
 
 ### `update-exif.sh`