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-rw-r--r--doc/apt_preferences.5.xml5
1 files changed, 5 insertions, 0 deletions
diff --git a/doc/apt_preferences.5.xml b/doc/apt_preferences.5.xml
index be6f12f6a..79132e007 100644
--- a/doc/apt_preferences.5.xml
+++ b/doc/apt_preferences.5.xml
@@ -254,6 +254,11 @@ Pin-Priority: 500
</programlisting>
</listitem>
</itemizedlist>
+
+The effect of the comma operator is similar to an "and" in logic: All
+conditions must be satisfied for the pin to match. There is one exception:
+For any type of condition (such as two "a" conditions), only the last such
+condition is checked.
</para>
</refsect2>