diff --git a/imageio/imageio-tiff/src/main/java/com/twelvemonkeys/imageio/plugins/tiff/TIFFExtension.java b/imageio/imageio-tiff/src/main/java/com/twelvemonkeys/imageio/plugins/tiff/TIFFExtension.java
index 4d3ed3e0..eb332395 100644
--- a/imageio/imageio-tiff/src/main/java/com/twelvemonkeys/imageio/plugins/tiff/TIFFExtension.java
+++ b/imageio/imageio-tiff/src/main/java/com/twelvemonkeys/imageio/plugins/tiff/TIFFExtension.java
@@ -101,5 +101,8 @@ interface TIFFExtension {
     int GROUP3OPT_2DENCODING = 1;
     int GROUP3OPT_UNCOMPRESSED = 2;
     int GROUP3OPT_FILLBITS = 4;
+    int GROUP3OPT_BYTEALIGNED = 8;
+
     int GROUP4OPT_UNCOMPRESSED = 2;
+    int GROUP4OPT_BYTEALIGNED = 4;
 }