diff --git a/core/modules/commands/listen.js b/core/modules/commands/listen.js
index dd22ea940..3c5f6a63a 100644
--- a/core/modules/commands/listen.js
+++ b/core/modules/commands/listen.js
@@ -39,7 +39,7 @@ Command.prototype.execute = function() {
 		variables: self.params
 	});
 	var nodeServer = this.server.listen();
-	$tw.hooks.invokeHook("th-server-command-post-start",this.server,nodeServer);
+	$tw.hooks.invokeHook("th-server-command-post-start",this.server,nodeServer,"tiddlywiki");
 	return null;
 };
 
diff --git a/core/modules/commands/server.js b/core/modules/commands/server.js
index fd1e4ea50..507d1281d 100644
--- a/core/modules/commands/server.js
+++ b/core/modules/commands/server.js
@@ -46,7 +46,7 @@ Command.prototype.execute = function() {
 		}
 	});
 	var nodeServer = this.server.listen();
-	$tw.hooks.invokeHook("th-server-command-post-start",this.server,nodeServer);
+	$tw.hooks.invokeHook("th-server-command-post-start",this.server,nodeServer,"tiddlywiki");
 	return null;
 };
 
diff --git a/editions/dev/tiddlers/new/Hook__th-server-command-post-start.tid b/editions/dev/tiddlers/new/Hook__th-server-command-post-start.tid
index cd30b42b1..4b42b4e35 100644
--- a/editions/dev/tiddlers/new/Hook__th-server-command-post-start.tid
+++ b/editions/dev/tiddlers/new/Hook__th-server-command-post-start.tid
@@ -14,5 +14,7 @@ Hook function parameters:
 ** Defined in core/modules/commands/server.js
 * NodeJS HTTP Server instance
 ** See the NodeJS docs at [ext[https://nodejs.org/docs/latest-v8.x/api/http.html#http_class_http_server]]
+* Name of server invoking this hook (for special handling of the NodeJS HTTP server instance argument). 
+** Current known values: `tiddlywiki`, `tiddlyserver`. 
 
 Return value is ignored.