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-rw-r--r--doc/apt_preferences.5.xml4
1 files changed, 4 insertions, 0 deletions
diff --git a/doc/apt_preferences.5.xml b/doc/apt_preferences.5.xml
index 16e6a7aa0..5703203b0 100644
--- a/doc/apt_preferences.5.xml
+++ b/doc/apt_preferences.5.xml
@@ -339,6 +339,10 @@ only if there is no installed version of the package</simpara></listitem>
<term>P &lt; 0</term>
<listitem><simpara>prevents the version from being installed</simpara></listitem>
</varlistentry>
+<varlistentry>
+<term>P = 0</term>
+<listitem><simpara>has undefined behaviour, do not use it.</simpara></listitem>
+</varlistentry>
</variablelist>
</para>