Noted allowed file name characters in /etc/apt/sources.list.d/* files.

debian/changelog

@@ -1,3 +1,12 @@
+apt (0.7.19) unstable; urgency=low
+
+  [ Eugene V. Lyubimkin ]
+  * doc/sources.list.5.xml:
+    - Mentioned allowed characters in file names in /etc/apt/sources.list.d.
+      Thanks to Matthias Urlichs. (Closes: #426913)
+
+ -- Eugene V. Lyubimkin <jackyf.devel@gmail.com>  Sat, 08 Nov 2008 12:40:19 +0200
+
 apt (0.7.18) unstable; urgency=low
 
   [ Christian Perrier ]

doc/sources.list.5.xml

@@ -48,9 +48,12 @@
  
  <refsect1><title>sources.list.d</title>
    <para>The <filename>/etc/apt/sources.list.d</filename> directory provides
-   a way to add sources.list entries in separate files whose names end with 
-   <literal>.list</literal>. The format is the same as for the regular
-   <filename>sources.list</filename> file. </para>
+   a way to add sources.list entries in separate files.
+   The format is the same as for the regular <filename>sources.list</filename> file.
+   File names need to end with
+   <filename>.list</filename> and may only contain letters (a-z and A-Z),
+   digits (0-9), underscore (_), hyphen (-) and period (.) characters.
+   Otherwise they will be silently ignored.</para>
  </refsect1>
 
  <refsect1><title>The deb and deb-src types</title>