add more help and hints

band-plan.html

@@ -300,10 +300,12 @@ div>label {
 		// eslint-disable-next-line no-unused-vars
 		function help() {
 			alert(
-				'Plan: use your own yml file for a band plan, URLs are possible, CORS needs to be allowed for the file\n'
+				'Base plan and Extension plan: use your own yml file for a band plan, URLs are possible, CORS needs to be allowed for the files, download standard files for examples\n'
 				+ 'Filter rows with text in column headings, use filter starting with "!" as exclusion\n'
-				+ 'Download list: saves .pdf of the current list\n'
-				+ 'Selection of rows with mouse possible'
+				+ 'Download list: saves .pdf of the current list (selection of rows apply)\n'
+				+ 'Selection of rows with mouse possible\n'
+				+ 'Download plans: get the yml plans\n'
+				+ 'Create link: get link for currently selected plans for bookmarking\n'
 			);
 		}
 	</script>
@@ -326,5 +328,9 @@ div>label {
 	</div>
 	<div id="data-table"></div>
 	<div id="error"></div>
+	<div>
+		<p>This information is supplied without liability.</p>
+		<p>Source is at <a href="https://src.dm5wk.de/dm5wk/band-plan-web/">https://src.dm5wk.de/dm5wk/band-plan-web/</a></p>
+	</div>
 </body>
 </html>