diff --git a/CHANGELOG.md b/CHANGELOG.md
index fad16d6..96cf5d5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,11 @@ major series.
 
 ## 2.x series
 
+### 2.1.3
+
+* Fix documentation builds on nightly due to syntax changes to
+  `#![fg_attr(feature = "nightly", doc = include_str!("../README.md"))]`.
+
 ### 2.1.2
 
 * Multiple documenation typo fixes.