Clarify the submodule host check
Change-Id: I5c7389f7c55aa4cb5fedeb75d5b80b6eaaa2e4bf
diff --git a/Documentation/user-submodules.txt b/Documentation/user-submodules.txt
index ef5a011..0de3298 100644
--- a/Documentation/user-submodules.txt
+++ b/Documentation/user-submodules.txt
@@ -189,14 +189,14 @@
Gerrit will only automatically update superprojects where the
submodules are hosted on the same Gerrit instance as the
-superproject. Gerrit determines this by checking the hostname of the
-submodule specified in the .gitmodules file and comparing it to the
-hostname from the link:config-gerrit.html#gerrit.canonicalWebUrl[
-`gerrit.canonicalWebUrl`].
+superproject. Gerrit determines this by checking that the URL of the
+submodule specified in the .gitmodules file starts with
+link:config-gerrit.html#gerrit.canonicalWebUrl[`gerrit.canonicalWebUrl`].
+The protocol part is ignored in this check.
It is currently not possible to use the submodule subscription feature
-with a canonical web URL hostname that differs from the hostname of
-the submodule. Instead relative submodules should be used.
+with a canonical web URL that differs from the first part of
+the submodule URL. Instead relative submodules should be used.
The Gerrit instance administrator should ensure that the canonical web
URL value is specified in its configuration file. Users should ensure
