1 files changed, 2 insertions, 0 deletions
diff --git a/src/chain.h b/src/chain.h
index a13dae33d1..76a774c123 100644
--- a/src/chain.h
+++ b/src/chain.h
@@ -144,6 +144,8 @@ enum BlockStatus: uint32_t {
     BLOCK_FAILED_VALID       =   32, //! stage after last reached validness failed
     BLOCK_FAILED_CHILD       =   64, //! descends from failed block
     BLOCK_FAILED_MASK        =   BLOCK_FAILED_VALID | BLOCK_FAILED_CHILD,
+
+    BLOCK_OPT_WITNESS       =   128, //! block data in blk*.data was received with a witness-enforcing client
 };
 
 /** The block chain is a tree shaped structure starting with the