diff --git a/docs/spec/blocks/ddt2.adoc b/docs/spec/blocks/ddt2.adoc
index 987a8b2..e0a1693 100644
--- a/docs/spec/blocks/ddt2.adoc
+++ b/docs/spec/blocks/ddt2.adoc
@@ -254,6 +254,10 @@ The following flags are defined:
 |Unencrypted
 |`0xA`
 |Sector content was originally encrypted on media but is stored decrypted in the image.
+
+|Generable
+|`0xB`
+|Sector content can be generated using a known algorithm (e.g., junk data on Nintendo GameCube/Wii discs).
 |===
 
 [NOTE]