diff --git a/Doc/tools/sgmlconv/conversion.xml b/Doc/tools/sgmlconv/conversion.xml
index 7ca4e52eb6d..f0151f43793 100644
--- a/Doc/tools/sgmlconv/conversion.xml
+++ b/Doc/tools/sgmlconv/conversion.xml
@@ -98,6 +98,9 @@
     <attribute name="name"/>
     <child name="args"/>
     </environment>
+  <environment name="csimplemacrodesc">
+    <attribute name="name"/>
+    </environment>
   <environment name="ctypedesc">
     <attribute name="tag" optional="yes"/>
     <attribute name="name"/>
@@ -734,6 +737,9 @@
   <macro name="cfunction">
     <content/>
     </macro>
+  <macro name="csimplemacro">
+    <content/>
+    </macro>
   <macro name="ctype">
     <content/>
     </macro>