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-rw-r--r--man/os-release.xml4
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diff --git a/man/os-release.xml b/man/os-release.xml
index 4acd1a9a57..7e3e9a73a8 100644
--- a/man/os-release.xml
+++ b/man/os-release.xml
@@ -75,6 +75,10 @@
from earliest boot on, and hence must be located on the root file
system.</para>
+ <para><filename>os-release</filename> must not contain repeating keys. Nevertheless, readers should pick
+ the entries later in the file in case of repeats, similarly to how a shell sourcing the file would. A
+ reader may warn about repeating entries.</para>
+
<para>For a longer rationale for <filename>os-release</filename>
please refer to the <ulink
url="http://0pointer.de/blog/projects/os-release">Announcement of <filename>/etc/os-release</filename></ulink>.</para>