diff --git a/doc/manual/manual.xml b/doc/manual/manual.xml
index a8620395..b9246b8f 100644
--- a/doc/manual/manual.xml
+++ b/doc/manual/manual.xml
@@ -11,7 +11,7 @@
     
     <xi:include href="meta/authors.xml"/>    
 
-    <date>January 6th, 2022</date>
+    <date>September 11th, 2022</date>
     
     <copyright>
       <year>2022</year>
diff --git a/lib/md2017_codeplug.hh b/lib/md2017_codeplug.hh
index 0e4add40..579cd2d1 100644
--- a/lib/md2017_codeplug.hh
+++ b/lib/md2017_codeplug.hh
@@ -69,6 +69,9 @@ public:
   typedef UV390Codeplug::MenuSettingsElement MenuSettingsElement;
 
   /** Contact element for MD2017 codeplugs.
+   *
+   * This class implements the same momory layout as the base TyTCodeplug::ContactElement. It just
+   * overrides the @c isValid method.
    *
    * Memory layout of encoded contact:
    * @verbinclude tyt_contact.txt */