diff --git a/docs/configuration.rst b/docs/configuration.rst
index d6bfb505..76a1fe5e 100644
--- a/docs/configuration.rst
+++ b/docs/configuration.rst
@@ -248,8 +248,7 @@ Database settings
 The admin service stores configurations in a database.
 
 - ``DB_FLAVOR``: the database type for mailu admin service. (``sqlite``, ``postgresql``, ``mysql``)
-- ``DB_HOST``: the database host for mailu admin service. (when not ``sqlite``)
-- ``DB_PORT``: the database port for mailu admin service. (when not ``sqlite``)
+- ``DB_HOST``: the database host for mailu admin service. For non-default ports use the notation `host:port`. (when not ``sqlite``)
 - ``DB_PW``: the database password for mailu admin service. (when not ``sqlite``)
 - ``DB_USER``: the database user for mailu admin service. (when not ``sqlite``)
 - ``DB_NAME``: the database name for mailu admin service. (when not ``sqlite``)
@@ -257,8 +256,7 @@ The admin service stores configurations in a database.
 The roundcube service stores configurations in a database.
 
 - ``ROUNDCUBE_DB_FLAVOR``: the database type for roundcube service. (``sqlite``, ``postgresql``, ``mysql``)
-- ``ROUNDCUBE_DB_HOST``: the database host for roundcube service. (when not ``sqlite``)
-- ``ROUNDCUBE_DB_PORT``: the database port for roundcube service. (when not ``sqlite``)
+- ``ROUNDCUBE_DB_HOST``: the database host for roundcube service. For non-default ports use the notation `host:port`. (when not ``sqlite``)
 - ``ROUNDCUBE_DB_PW``: the database password for roundcube service. (when not ``sqlite``)
 - ``ROUNDCUBE_DB_USER``: the database user for roundcube service. (when not ``sqlite``)
 - ``ROUNDCUBE_DB_NAME``: the database name for roundcube service. (when not ``sqlite``)
diff --git a/setup/templates/steps/database.html b/setup/templates/steps/database.html
index 82b6b0d2..03cb50b1 100644
--- a/setup/templates/steps/database.html
+++ b/setup/templates/steps/database.html
@@ -14,7 +14,7 @@
 		<input class="form-control" type="text" name="db_user" placeholder="Username" id="db_user">
 		<label>Db Password</label>
 		<input class="form-control" type="password" name="db_pw" placeholder="Password" id="db_pw">
-		<label>Db URL</label>
+		<label>Db URL (for using a different port use the notation host:port )</label>
 		<input class="form-control" type="text" name="db_url" placeholder="URL" id="db_url">
 		<label>Db Name</label>
 		<input class="form-control" type="text" name="db_name" placeholder="Database Name" id="db_name">
@@ -33,7 +33,7 @@
 				<input class="form-control" type="text" name="roundcube_db_user" placeholder="Username" id="roundcube_db_user">
 				<label>DB Password</label>
 				<input class="form-control" type="password" name="roundcube_db_pw" placeholder="Password" id="roundcube_db_pw">
-				<label>DB URL</label>
+				<label>DB URL (for using a different port use the notation host:port )</label>
 				<input class="form-control" type="text" name="roundcube_db_url" placeholder="URL" id="roundcube_db_url">
 				<label>DB Name</label>
 				<input class="form-control" type="text" name="roundcube_db_name" placeholder="Database Name" id="roundcube_db_name">
diff --git a/towncrier/newsfragments/2073.bugfix b/towncrier/newsfragments/2073.bugfix
new file mode 100644
index 00000000..dd97c76b
--- /dev/null
+++ b/towncrier/newsfragments/2073.bugfix
@@ -0,0 +1 @@
+The DB_PORT and ROUNDCUBE_DB_PORT environment variables were not actually used. They are removed from the documentation. For using different ports you can already use the notation host:port .