diff --git a/p6.md b/p6.md
index 641c2714b89e2b7ffd6bc04060aed1755254e610..528371849d89fe8bce19cbfb76cbc572e26712e8 100644
--- a/p6.md
+++ b/p6.md
@@ -178,6 +178,8 @@ to be included in the annotation.
 The following shows the execution timeline of transactions 1, 2, and 3
 from *scriptKV.1* and *scriptKV.2*:
 ![timeline](https://ceres.cs.umd.edu/818/projects/p6scripts.png)
+Each of the transactions *executes atomically* at the associated
+dotted line.
 
 ## Details
 - Start/finish transaction commands should have *oids* matching their *tids*.