diff --git a/functions/sem.xml b/functions/sem.xml
index 7b60046b9a..ae84cb7646 100644
--- a/functions/sem.xml
+++ b/functions/sem.xml
@@ -40,6 +40,11 @@
      </tgroup>
     </table>
    </para>
+   <note>
+    <simpara>
+     These functions do not work on Windows systems.
+    </simpara>
+   </note>
   </partintro>
 
   <refentry id="function.sem-get">
@@ -83,6 +88,11 @@
      See also: <function>sem_acquire</function> and
      <function>sem_release</function>.
     </para>
+    <note>
+     <simpara>
+      This function does not work on Windows systems
+     </simpara>
+    </note>
    </refsect1>
   </refentry>
 
@@ -150,6 +160,11 @@
      See also: <function>sem_get</function> and
      <function>sem_acquire</function>.
     </para>
+    <note>
+     <simpara>
+      This function does not work on Windows systems
+     </simpara>
+    </note>    
    </refsect1>
   </refentry>
 
@@ -187,6 +202,11 @@
      shared memory. <parameter>Memsize</parameter> and
      <parameter>perm</parameter> will be ignored.
     </para>
+    <note>
+     <simpara>
+      This function does not work on Windows systems
+     </simpara>
+    </note>
    </refsect1>
   </refentry>
 
@@ -229,6 +249,11 @@
      Removes shared memory from Unix systems. All data will be
      destroyed.
     </para>
+    <note>
+     <simpara>
+      This function does not work on Windows systems
+     </simpara>
+    </note>
    </refsect1>
   </refentry>
 
@@ -253,6 +278,11 @@
      <parameter>variable_key</parameter>. All variable-types (double,
      int, string, array) are supported.
     </para> 
+    <note>
+     <simpara>
+      This function does not work on Windows systems
+     </simpara>
+    </note>
    </refsect1>
   </refentry>
 
@@ -276,6 +306,11 @@
      <parameter>variable_key</parameter>. The variable is still present
      in the shared memory.
     </para>
+    <note>
+     <simpara>
+      This function does not work on Windows systems
+     </simpara>
+    </note>
    </refsect1>
   </refentry>
 
@@ -298,6 +333,11 @@
      Removes a variable with a given <parameter>variable_key</parameter>
      and frees the occupied memory.
     </para>
+    <note>
+     <simpara>
+      This function does not work on Windows systems
+     </simpara>
+    </note>
    </refsect1>
   </refentry>