diff --git a/0.5.1c.md b/0.5.1c.md
index d44374b..50f9f97 100644
--- a/0.5.1c.md
+++ b/0.5.1c.md
@@ -20,4 +20,7 @@ for Minecraft 1.18.2, 1.19.2 & 1.20.1 released on July 5th, 2023.
 - Separated config options for placing fluid blocks with Create (attackeight)
 - Optimisations to some of Create's vector math shortcuts (Timo van Veen)
 - Addons can now register backtank-esque air sources placed in any armor and curios slots (Michael C)
-- Addressed a number of memory leaks and server crashes
\ No newline at end of file
+- Addressed a number of memory leaks and server crashes
+
+## 0.5.1d hotfix for 1.20:
+- Fixed crash when colliding with mechanical belts on recent forge versions