diff --git a/documentation/content/en/books/porters-handbook/upgrading/_index.adoc b/documentation/content/en/books/porters-handbook/upgrading/_index.adoc
--- a/documentation/content/en/books/porters-handbook/upgrading/_index.adoc
+++ b/documentation/content/en/books/porters-handbook/upgrading/_index.adoc
@@ -149,6 +149,8 @@
 
 Make sure to check the port using the checklist in crossref:quick-porting[porting-testing,Testing the Port] and crossref:quick-porting[porting-portlint,Checking the Port with `portlint`].
 
+Also, update the checksum reference in distinfo with `make makesum`.
+
 Before making the patch, fetch the latest repository and rebase the changes on top of it.
 Watch and follow the output carefully.
 If any of the files failed to rebase, it means that the upstream files changed while you were editing the same file, and the conflicts need to be resolved manually.