[master] d084467a4 Amend the docs on the '-I' option

[Nils Goroll]

commit d084467a4e478adbd09da1231229bb8db8d3ceee
Author: Martin Blix Grydeland <martin at varnish-software.com>
Date:   Thu Nov 11 16:31:32 2021 +0100

    Amend the docs on the '-I' option
    
    Make a note in the documentation of CLI Command File that it is necessary
    to include an explicit 'vcl.use' command in the script.

diff --git a/doc/sphinx/reference/varnishd.rst b/doc/sphinx/reference/varnishd.rst
index 844487467..cdb08d40e 100644
--- a/doc/sphinx/reference/varnishd.rst
+++ b/doc/sphinx/reference/varnishd.rst
@@ -510,6 +510,10 @@ a newline or carriage return.
 If a command in the file is prefixed with '-', failure will not abort
 the startup.
 
+Note that it is necessary to include an explicit `vcl.use` command to
+select which VCL should be the active VCL when relying on CLI Command File
+to load the configurations at startup.
+
 .. _ref-varnishd-params:
 
 RUN TIME PARAMETERS