diff --git a/HISTORY.md b/HISTORY.md
index 35fb87345f9..ee403f3580d 100644
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -13,6 +13,7 @@ Changes to JGraphT in each version:
     - Added support for custom names in vertices/edges collections in JSON I/O (contributed by Dimitrios Michail)
     - Fixed assertion message in succinct graphs (contributed by Rostislav Svoboda)
     - Made result ordering predictable in some algorithms (contributed by Dimitrios Michail)
+    - Added user guide for WebGraph and Sux4J adapters (contributed by Sebastiano Vigna)
 
 - **version 1.5.1** (18-Mar-2021)
     - Prepared release cycle 1.5.1: removed deprecated code, updated dependencies (contributed by Joris Kinable)