diff --git a/doc/unordered/changes.adoc b/doc/unordered/changes.adoc
index 72a800c4..4064aa89 100644
--- a/doc/unordered/changes.adoc
+++ b/doc/unordered/changes.adoc
@@ -20,6 +20,7 @@
 * Various warning fixes in the test suite.
 * Update code to internally use `boost::allocator_traits`.
 * Switch to Fibonacci hashing.
+* Update documentation to be written in AsciiDoc instead of QuickBook.
 
 == Release 1.67.0