diff --git a/band-plan.html b/band-plan.html
index ca35c2b..9d4dc5e 100644
--- a/band-plan.html
+++ b/band-plan.html
@@ -66,7 +66,7 @@ div>label {
 			location.search.substr(1).split("&").forEach((param) => {
 				let p = param.split("=");
 				let key = p[0];
-				["base", "extension", "css"].forEach((id) => {
+				["base", "regulation", "css"].forEach((id) => {
 					if (key === id) {
 						document.getElementById(id + "_input").value = decodeURIComponent(p[1]);
 					}
@@ -74,7 +74,7 @@ div>label {
 			});
 			update_inputs();
 
-			["base", "extension", "css"].forEach((id) => {
+			["base", "regulation", "css"].forEach((id) => {
 				// download buttons
 				create_element_link(document.getElementById("download_" + id), document.getElementById(id + "_input").value);
 				// enter on input fields
@@ -88,7 +88,7 @@ div>label {
 			create_element_link(document.getElementById("create_link"), function() {
 				return window.location.href.split("?")[0] + "?"
 					+ "base=" + document.getElementById("base_input").value
-					+ "&extension=" + document.getElementById("extension_input").value
+					+ "&regulation=" + document.getElementById("regulation_input").value
 					+ "&css=" + document.getElementById("css_input").value;
 			});
 		});
@@ -149,11 +149,13 @@ div>label {
 						}
 					});
 					document.getElementById("comments_" + key).innerHTML = s;
+				} else {
+					document.getElementById("comments_" + key).innerHTML = "";
 				}
 			};
 		}
 
-		function update_table(bases, extensions) {
+		function update_table(bases, regulations) {
 			let tdata = [];
 			let header = {};
 
@@ -169,53 +171,53 @@ div>label {
 				if ((typeof base.header === "undefined") || (base.header == false)) {
 					let row = {};
 
-					// first, fill ext_header
-					extensions.forEach((ext) => {
-						if ((typeof ext.header !== "undefined") && ext.header) {
-							header["extension"] = structuredClone(ext);
+					// first, fill reg_header
+					regulations.forEach((reg) => {
+						if ((typeof reg.header !== "undefined") && reg.header) {
+							header["regulation"] = structuredClone(reg);
 						}
 					});
 
 					fill_comments(header);
 
 					// then fill tdata
-					extensions.forEach((ext) => {
-						if ((typeof ext.header === "undefined") || (ext.header == false)) {
+					regulations.forEach((reg) => {
+						if ((typeof reg.header === "undefined") || (reg.header == false)) {
 							add_column(row, base, header["base"]);
 
-							let [ext_start, ext_end] = ext.frequency.split("-");
-							ext_start = Qty(Number(ext_start), header["extension"].frequency_unit).to(header["base"].frequency_unit).scalar;
-							ext_end = Qty(Number(ext_end), header["extension"].frequency_unit).to(header["base"].frequency_unit).scalar;
+							let [reg_start, reg_end] = reg.frequency.split("-");
+							reg_start = Qty(Number(reg_start), header["regulation"].frequency_unit).to(header["base"].frequency_unit).scalar;
+							reg_end = Qty(Number(reg_end), header["regulation"].frequency_unit).to(header["base"].frequency_unit).scalar;
 							if (typeof base.frequency === "number") {
 								// at single frequency 
-								if (isInRange(base.frequency, ext_start, ext_end)) {
-									add_column(row, ext, header["extension"]);
+								if (isInRange(base.frequency, reg_start, reg_end)) {
+									add_column(row, reg, header["regulation"]);
 									tdata.push(row);
 								}
 							} else {
 								// frequeny range
 								let [base_start, base_end] = base.frequency.split("-");
-								if (isInRange(base_start, ext_start, ext_end) && isInRange(base_end, ext_start, ext_end)) {
-									// base range is inside of ext range or the same
-									add_column(row, ext, header["extension"]);
+								if (isInRange(base_start, reg_start, reg_end) && isInRange(base_end, reg_start, reg_end)) {
+									// base range is inside of reg range or the same
+									add_column(row, reg, header["regulation"]);
 									tdata.push(row);
 								} else {
-									// base range is split by ext range
-									if ((base_end > ext_start) && isInRange(ext_start, base_start, base_end)) {
-										// base range starts below ext range
+									// base range is split by reg range
+									if ((base_end > reg_start) && isInRange(reg_start, base_start, base_end)) {
+										// base range starts below reg range
 										let r = structuredClone(row);
-										let start = ext_start;
-										let end = base_end < ext_end ? base_end : ext_end;
+										let start = reg_start;
+										let end = base_end < reg_end ? base_end : reg_end;
 										r["frequency"] = start + "-" + end;
-										add_column(r, ext, header["extension"]);
+										add_column(r, reg, header["regulation"]);
 										tdata.push(r);
-									} else if ((ext_end > base_start) && isInRange(ext_end, base_start, base_end)) {
-										// ext range starts below base range
+									} else if ((reg_end > base_start) && isInRange(reg_end, base_start, base_end)) {
+										// reg range starts below base range
 										let r = structuredClone(row);
 										let start = base_start;
-										let end = ext_end;
+										let end = reg_end;
 										r["frequency"] = start + "-" + end;
-										add_column(r, ext, header["extension"]);
+										add_column(r, reg, header["regulation"]);
 										tdata.push(r);
 									}
 								}
@@ -293,8 +295,8 @@ div>label {
 						if (typeof header["base"].titles[column.field] !== "undefined") {
 							column.title = header["base"].titles[column.field];
 						}
-						if (typeof header["extension"].titles[column.field] !== "undefined") {
-							column.title = header["extension"].titles[column.field];
+						if (typeof header["regulation"].titles[column.field] !== "undefined") {
+							column.title = header["regulation"].titles[column.field];
 						}
 
 						// add css styles for formatting based on cell values
@@ -366,7 +368,7 @@ div>label {
 		function update_inputs() {
 			Promise.all([
 				fetch(document.getElementById("base_input").value, {	mode: "cors" }),
-				fetch(document.getElementById("extension_input").value, {	mode: "cors" }),
+				fetch(document.getElementById("regulation_input").value, {	mode: "cors" }),
 			]).then((res) => {
 				res.forEach((r) => {
 					if (!r.ok) {
@@ -375,7 +377,11 @@ div>label {
 				});
 				Promise.all([res[0].text(), res[1].text()]).then((d) => {
 					try {
-						update_table(yaml.load(d[0]),yaml.load(d[1]));
+						let reg = d[1];
+						if (reg === "") {
+							reg = "- header: true\n  columns: []\n  titles: []\n  frequency_unit: GHz\n- frequency: 0-" + 9007199254740991;
+						}
+						update_table(yaml.load(d[0]), yaml.load(reg));
 					} catch (e) {
 						display_error(e);
 					}
@@ -407,7 +413,9 @@ div>label {
 		// eslint-disable-next-line no-unused-vars
 		function help() {
 			alert(
-				"Base plan, extension plan and css: use your own files for the band plan and css, URLs are possible, CORS needs to be allowed for the files, download standard files for examples\n"
+				"Base plan, regulation and css: use your own files for the band plan and css, URLs are possible, CORS needs to be allowed for the files, download standard files for examples\n"
+				+ "When Regulation is empty, all frequencies from base plan will be included\n"
+				+ "When CSS is empty or URL not available, colors, etc. will be gone\n"
 				+ "Filter rows with text in column headings, use filter starting with \"!\" as exclusion\n"
 				+ "Download list: saves .pdf of the current list (selection of rows apply)\n"
 				+ "Selection of rows with mouse possible\n"
@@ -420,8 +428,8 @@ div>label {
 	<label>Base Plan:
 		<input id="base_input" type="text" value="band-plan-iaru_r1_hf.yml">
 	</label>
-	<label>Extension:
-		<input id="extension_input" type="text" value="band-plan-de.yml">
+	<label>Regulation:
+		<input id="regulation_input" type="text" value="regulations-de.yml">
 	</label>
 	<label>CSS:
 		<input id="css_input" type="text" value="standard.css">
@@ -432,7 +440,7 @@ div>label {
 	<div> 
 		<button id="download">Download list</button>
 		<button id="download_base">Download base plan</button>
-		<button id="download_extension">Download extension plan</button>
+		<button id="download_regulation">Download regulation</button>
 		<button id="download_css">Download css file</button>
 		<button id="create_link">Create link</button>
 		<button onclick="help()">Help</button>
@@ -440,7 +448,7 @@ div>label {
 	<div id="data-table"></div>
 	<div id="error"></div>
 	<div id="comments_base"></div>
-	<div id="comments_extension"></div>
+	<div id="comments_regulation"></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>
diff --git a/band-plan-de.yml b/regulations-de.yml
similarity index 100%
rename from band-plan-de.yml
rename to regulations-de.yml