diff --git a/reference/pcre/pattern.syntax.xml b/reference/pcre/pattern.syntax.xml
index 98d239fe64df..473459a7f938 100644
--- a/reference/pcre/pattern.syntax.xml
+++ b/reference/pcre/pattern.syntax.xml
@@ -610,6 +610,25 @@
    <function>preg_match</function>. It differs from <literal>\A</literal>
    when the value of <parameter>offset</parameter> is non-zero.
   </para>
+  <simpara>
+   Backslash is also used for the following sequences:
+  </simpara>
+  <para>
+   <variablelist>
+    <varlistentry>
+     <term><emphasis>\Q</emphasis></term>
+     <listitem><simpara>start of a quoted sequence, metacharacters up to <literal>\E</literal> are treated as literals</simpara></listitem>
+    </varlistentry>
+    <varlistentry>
+     <term><emphasis>\E</emphasis></term>
+     <listitem><simpara>end of a quoted sequence started by <literal>\Q</literal></simpara></listitem>
+    </varlistentry>
+    <varlistentry>
+     <term><emphasis>\K</emphasis></term>
+     <listitem><simpara>reset the start of the reported match</simpara></listitem>
+    </varlistentry>
+   </variablelist>
+  </para>
 
   <para>
    <literal>\Q</literal> and <literal>\E</literal> can be used to ignore