diff --git a/fhem/docs/commandref_frame.html b/fhem/docs/commandref_frame.html
index 1dfb3371c..9f5e0f635 100644
--- a/fhem/docs/commandref_frame.html
+++ b/fhem/docs/commandref_frame.html
@@ -418,6 +418,15 @@ Device specific attributes are documented in the corresponding device section.
         grouping attribute.
         </li><br>
 
+    <a name="overrideNotifydev"></a>
+    <li>overrideNotifydev<br>
+        if set (the argument is a devspec), the optimization for notifications
+        is using this value instead of the module-set NOTIFYDEV internal.
+        Use it only, if you know it better than the module maintainer.
+        In order to be available, the global or the device userattr must be set
+        first, to include it.
+        </li><br>
+
     <a name="room"></a>
     <li>room<br>
         Filter/group devices in frontends. A device can appear in more than one
diff --git a/fhem/docs/commandref_frame_DE.html b/fhem/docs/commandref_frame_DE.html
index ccebd0996..7298740e1 100644
--- a/fhem/docs/commandref_frame_DE.html
+++ b/fhem/docs/commandref_frame_DE.html
@@ -416,6 +416,16 @@ Ger&auml;t dokumentiert.
        gesetzte Ger&auml;tetyp verwendet.
       </li><br>
 
+    <a name="overrideNotifydev"></a>
+    <li>overrideNotifydev<br>
+        falls gesetzt (das Argument ist ein devspec), dann verwendet die
+        Optimierung der Benachrichtigungen diesen Wert, statt das vom Modul
+        gesetzte Internal NOTIFYDEV. Man sollte es nur dann setzen, falls
+        man es besser weiss, als der Modul Maintainer. Damit es setzbar ist,
+        muss vorher das global oder Ger&auml;te spezifische userattr
+        Attribut erg&auml;nzt werden.
+        </li><br>
+
     <a name="room"></a>
     <li>room<br>
        Filtert/gruppiert Ger&auml;te.
diff --git a/fhem/fhem.pl b/fhem/fhem.pl
index 35ef17605..392360dcc 100755
--- a/fhem/fhem.pl
+++ b/fhem/fhem.pl
@@ -5630,7 +5630,8 @@ createNtfyHash()
   my %d2a_cache;
   %ntfyHash = ("*" => []);
   foreach my $d (@ntfyList) {
-    my $ndl = $defs{$d}{NOTIFYDEV};
+    my $ndl = $attr{$d}{overrideNotifydev};
+    $ndl = $defs{$d}{NOTIFYDEV} if(!$ndl);
     next if(!$ndl);
     my @ndlarr;
     if($d2a_cache{$ndl}) {
@@ -5648,7 +5649,8 @@ createNtfyHash()
 
   my @nhk = keys %ntfyHash;
   foreach my $d (@ntfyList) {
-    my $ndl = $defs{$d}{NOTIFYDEV};
+    my $ndl = $attr{$d}{overrideNotifydev};
+    $ndl = $defs{$d}{NOTIFYDEV} if(!$ndl);
     my $arr = ($ndl ? $d2a_cache{$ndl} : \@nhk);
     map { push @{$ntfyHash{$_}}, $d } @{$arr};
   }