diff --git a/HISTORY.md b/HISTORY.md
index a941b58491..088a25c748 100644
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -1,5 +1,7 @@
 ### mlpack ?.?.?
 ###### ????-??-??
+  * Added Categorical DQN to q_networks (#2454).
+
   * Added N-step DQN to q_networks (#2461).
 
   * Add Silhoutte Score metric and Pairwise Distances (#2406).