diff --git a/syndicate/HOWITWORKS.md b/syndicate/HOWITWORKS.md
index 10fd59f..6b637f5 100644
--- a/syndicate/HOWITWORKS.md
+++ b/syndicate/HOWITWORKS.md
@@ -557,10 +557,10 @@ interested in the `present` constructor.
       relayed assertion to do so.
     - There's also a need for `(opaque-placeholder)`s to frustrate
       constant-matching against literal `(discard)` in cases of
-      visibility restriction. See commit b4f1d36 and test case
+      visibility restriction. See commit 937bb7a and test case
       `test/core/nesting-confusion-2.rkt`.
     - HOWEVER see notes from 2019-06-18 in the googledoc Journal as
-      well as in my notebook. See also commit 5c514b7 from
+      well as in my notebook. See also commit 5923bdd from
       imperative-syndicate and e806f4b from syndicate-js. The
       opaque-placeholders make the distributed (= non-zero-latency)
       case of visibility-restriction handling problematic in general,