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-rw-r--r--doc/apt_preferences.5.xml7
1 files changed, 7 insertions, 0 deletions
diff --git a/doc/apt_preferences.5.xml b/doc/apt_preferences.5.xml
index 159d61f2b..9a4791c08 100644
--- a/doc/apt_preferences.5.xml
+++ b/doc/apt_preferences.5.xml
@@ -53,6 +53,13 @@ earliest in the &sources-list; file.
The APT preferences file does not affect the choice of instance, only
the choice of version.</para>
+<para>Note that the files in the <filename>/etc/apt/preferences.d</filename>
+directory are parsed in alphanumeric ascending order and need to obey the
+following naming convention: The files have no or "<literal>pref</literal>"
+as filename extension and which only contain alphanumeric, hyphen (-),
+underscore (_) and period (.) characters - otherwise they will be silently
+ignored.</para>
+
<refsect2><title>APT's Default Priority Assignments</title>
<para>If there is no preferences file or if there is no entry in the file