diff --git a/FORMATS.md b/FORMATS.md
index a749f8f4..939b56cf 100644
--- a/FORMATS.md
+++ b/FORMATS.md
@@ -28,4 +28,5 @@ For those who want to directly compress/decompress bits
 | GZipStream | Both |
 | DeflateStream | Both |
 | LZMAStream | Both |
-| PPMdStream | Both |
\ No newline at end of file
+| PPMdStream | Both |
+| ADCStream | Decompress |