diff --git a/HISTORY.md b/HISTORY.md
index e5883ec98b..5541f6326d 100644
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -1,6 +1,11 @@
 ### mlpack ?.?.?
 ###### ????-??-??
 
+### mlpack 2.2.1
+###### 2017-04-13
+  * Compilation fix for mlpack_nca and mlpack_test on older Armadillo versions
+    (#984).
+
 ### mlpack 2.2.0
 ###### 2017-03-21
   * Bugfix for mlpack_knn program (#816).