doc: expand openssl instructions

mhdawson · mhdawson · commit 1a421322c1cc · 2020-12-17T13:08:37.000-05:00
Refs: nodejs#36541 Expand the instructions to cover what is needed when updates are required across all active release lines
diff --git a/doc/guides/maintaining-openssl.md b/doc/guides/maintaining-openssl.md
@@ -2,6 +2,18 @@
 
 This document describes how to update `deps/openssl/`.
 
+If you need to provide updates across all active release lines you will
+currently need to generate two PRs as follows:
+
+* a PR following the instruction below based on the main branch.
+  This PR should cherry pick back to the active release lines
+  except for the 10.x line.
+* a PR which uses the same commit from the first PR to apply the
+  updates to the openssl source code, with a new commit generated
+  by following steps 2 onwards on the 10.x line. This is
+  necessary because differences in 10.x requires that the
+  configuration files be regenerated specifically for 10.x.
+
 ## Requirements
 * Linux environment.
 * `perl` Only Perl version 5 is tested.
