From af4b8f8048e2d2da0b1a1a4927339cf39c62fb8a Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Fri, 16 Oct 2020 18:22:37 +0200
Subject: [PATCH] man: document that ConditionKernelCommandLine= looks at
 /proc/1/environ in containers

Fixes: #16941
---
 man/systemd.unit.xml | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/man/systemd.unit.xml b/man/systemd.unit.xml
index f23c903d069..27035798bc2 100644
--- a/man/systemd.unit.xml
+++ b/man/systemd.unit.xml
@@ -1207,7 +1207,10 @@
           argument must either be a single word, or an assignment (i.e. two words, separated by
           <literal>=</literal>). In the former case the kernel command line is searched for the word
           appearing as is, or as left hand side of an assignment. In the latter case, the exact assignment is
-          looked for with right and left hand side matching.</para>
+          looked for with right and left hand side matching. This operates on the kernel command line
+          communicated to userspace via <filename>/proc/cmdline</filename>, except when the service manager
+          is invoked as payload of a container manager, in which case the command line of <filename>PID
+          1</filename> is used instead (i.e. <filename>/proc/1/cmdline</filename>).</para>
           </listitem>
         </varlistentry>