diff --git a/Changelog.md b/Changelog.md
index db4252912..3bdd366db 100644
--- a/Changelog.md
+++ b/Changelog.md
@@ -7,6 +7,7 @@ Features:
  * Limit the number of warnings raised for creating abstract contracts.
  * Inline Assembly: Issue warning for using jump labels (already existed for jump instructions).
  * Inline Assembly: Support some restricted tokens (return, byte, address) as identifiers in Julia mode.
+ * Optimiser: Replace `x % 2**i` by `x & (2**i-1)`.
  * SMT Checker: If-else branch conditions are taken into account in the SMT encoding of the program
    variables.
  * Syntax Checker: Deprecate the ``var`` keyword (and mark it an error as experimental 0.5.0 feature).