diff --git a/reference/filesystem/functions/fputcsv.xml b/reference/filesystem/functions/fputcsv.xml
index 29d6f0ed94..494367a320 100644
--- a/reference/filesystem/functions/fputcsv.xml
+++ b/reference/filesystem/functions/fputcsv.xml
@@ -70,6 +70,13 @@
     </varlistentry>
    </variablelist>
   </para>
+  <note>
+   <para>
+    If an <parameter>enclosure</parameter> character is contained in a field,
+    it will be escaped by doubling it, unless it is immediately preceded by an
+    <parameter>escape_char</parameter>.
+   </para>
+  </note> 
  </refsect1>
 
  <refsect1 role="returnvalues">