diff --git a/reference/filesystem/functions/link.xml b/reference/filesystem/functions/link.xml
index 1088d822c9..c2e150dacf 100644
--- a/reference/filesystem/functions/link.xml
+++ b/reference/filesystem/functions/link.xml
@@ -49,6 +49,14 @@
   </para>
  </refsect1>
 
+ <refsect1 role="errors">
+  &reftitle.errors;
+  <para>
+   The function fails, and issues <constant>E_WARNING</constant>, if <parameter>link</parameter>
+   already exists, or if <parameter>target</parameter> does not exist.
+  </para>
+ </refsect1>
+
  <refsect1 role="examples">
   &reftitle.examples;
   <para>
@@ -87,6 +95,7 @@ link($target, $link);
     <member><function>symlink</function></member>
     <member><function>readlink</function></member>
     <member><function>linkinfo</function></member>
+    <member><function>unlink</function></member>
    </simplelist>
   </para>
  </refsect1>
diff --git a/reference/filesystem/functions/symlink.xml b/reference/filesystem/functions/symlink.xml
index 8047a68fca..84ddac1f59 100644
--- a/reference/filesystem/functions/symlink.xml
+++ b/reference/filesystem/functions/symlink.xml
@@ -51,6 +51,16 @@
   </para>
  </refsect1>
 
+ <refsect1 role="errors">
+  &reftitle.errors;
+  <para>
+   The function fails, and issues <constant>E_WARNING</constant>,
+   if <parameter>link</parameter> already exists.
+   On Windows, the function also fails, and issues <constant>E_WARNING</constant>,
+   if <parameter>target</parameter> does not exist.
+  </para>
+ </refsect1>
+
  <refsect1 role="examples">
   &reftitle.examples;
   <para>
@@ -78,6 +88,7 @@ echo readlink($link);
     <member><function>link</function></member>
     <member><function>readlink</function></member>
     <member><function>linkinfo</function></member>
+    <member><function>unlink</function></member>
    </simplelist>
   </para>
  </refsect1>