diff --git a/CHANGELOG.md b/CHANGELOG.md
index f18c74dd5aa8ab673403b2a92c343d41a13711dd..21375bfb0d0e78a504d5bc8a8b94b6bd96fec5c1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -207,7 +207,7 @@ Coq development, but not every API-breaking change is listed.  Changes marked
   numbers`.
 * Remove notation for 3-mask step-taking updates, and made 2-mask notation less
   confusing by distinguishing it better from mask-changing updates.
-  Old: `|={E1,E2]â–·=> P`. New: `|={Eo}[Ei]â–·=> P`.
+  Old: `|={E1,E2}â–·=> P`. New: `|={Eo}[Ei]â–·=> P`.
   As part of this, the lemma `step_fupd_mask_mono` now also has a more
   consistent argument order for its masks.