diff --git a/design/data-flow.md b/design/data-flow.md
index d6ad83b6..94b921cd 100644
--- a/design/data-flow.md
+++ b/design/data-flow.md
@@ -15,3 +15,5 @@
         - Sum up "LegacySigOps" for each transaction and check that it's less than some maximum
     - Acquires a lock, then calls `MarkBlockAsReceived` (networking?) and then calls `AcceptBlock`
         - 
+- ContextualCheckBlock
+