+#. type: Content of: <refentry><refsect1><para><itemizedlist><listitem><para>
+#: sources.list.5.xml
+msgid ""
+"<option>PDiffs</option> (<option>pdiffs</option>) is a yes/no value which "
+"controls if APT should try to use PDiffs to update old indexes instead of "
+"downloading the new indexes entirely. The value of this option is ignored if "
+"the repository doesn't announce the availability of PDiffs. Defaults to the "
+"value of the option with the same name for a specific index file defined in "
+"the <option>Acquire::IndexTargets</option> scope, which itself default to "
+"the value of configuration option <option>Acquire::PDiffs</option> which "
+"defaults to <literal>yes</literal>."
+msgstr ""
+
+#. type: Content of: <refentry><refsect1><para><itemizedlist><listitem><para>
+#: sources.list.5.xml
+msgid ""
+"<option>By-Hash</option> (<option>by-hash</option>) can have the value \"yes"
+"\", \"no\" or \"force\" and controls if APT should try to acquire indexes "
+"via an URI constructed from a hashsum of the expected file instead of using "
+"the well-known stable filename of the index. Using this can avoid hashsum "
+"mismatches, but requires a supporting mirror. The value \"yes\"/\"no\" "
+"activates/disables the use of this feature if this source indicates support "
+"for it, while \"force\" will enable the feature regardless of what the "
+"source indicates. Defaults to the value of the option of the same name for "
+"a specific index file defined in the <option>Acquire::IndexTargets</option> "
+"scope, which itself defaults to the value of configuration option "
+"<option>Acquire::By-Hash</option> which defaults to <literal>yes</literal>."
+msgstr ""
+