diff --git a/UPGRADING.md b/UPGRADING.md
index 3ce2136158f..58bdbd05cf2 100644
--- a/UPGRADING.md
+++ b/UPGRADING.md
@@ -4,6 +4,9 @@ Upgrading
 This document summarizes the environmental changes that need to be made when
 upgrading IRIDA that cannot be automated.
 
+21.01.3 to 21.05
+--------------
+* This upgrade makes schema changes to the databases and cannot be parallel deployed.  Servlet container must be stopped before deploying the new `war` file.
 
 21.01 to 21.01.3
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