diff --git a/demos/sankey.html b/demos/sankey.html
index c35b907d2..d6ae1d2ec 100644
--- a/demos/sankey.html
+++ b/demos/sankey.html
@@ -1,23 +1,22 @@
 <!DOCTYPE html>
 <html lang="en" xmlns="http://www.w3.org/1999/html">
+  <head>
+    <meta charset="utf-8" />
+    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
+    <title>States Mermaid Quick Test Page</title>
+    <link rel="icon" type="image/png" href="data:image/png;base64,iVBORw0KGgo=" />
+    <style>
+      div.mermaid {
+        /* font-family: 'trebuchet ms', verdana, arial; */
+        font-family: 'Courier New', Courier, monospace !important;
+      }
+    </style>
+  </head>
 
-<head>
-  <meta charset="utf-8" />
-  <meta http-equiv="X-UA-Compatible" content="IE=edge" />
-  <title>States Mermaid Quick Test Page</title>
-  <link rel="icon" type="image/png" href="data:image/png;base64,iVBORw0KGgo=" />
-  <style>
-    div.mermaid {
-      /* font-family: 'trebuchet ms', verdana, arial; */
-      font-family: 'Courier New', Courier, monospace !important;
-    }
-  </style>
-</head>
-
-<body>
-  <h1>Sankey diagram demos</h1>
-  <h2>Simple example</h2>
-  <pre class="mermaid">
+  <body>
+    <h1>Sankey diagram demos</h1>
+    <h2>Simple example</h2>
+    <pre class="mermaid">
     sankey
 
     node[title="hello, how are you?"]
@@ -26,11 +25,12 @@
     First -> 30 -> Second
     First -> 10 -> Third 
     Second -> 20 -> Third
-  </pre>
-  <!-- node[title="hello, mister "sankey", backslash for you "] -->
+  </pre
+    >
+    <!-- node[title="hello, mister "sankey", backslash for you "] -->
 
-  <h2>Energy flow</h2>
-  <pre class="mermaid">
+    <h2>Energy flow</h2>
+    <pre class="mermaid">
     sankey
 
     "Agricultural 'waste'"      ->      124.729  -> "Bio-conversion"
@@ -101,19 +101,19 @@
     "UK land based bioenergy"   ->      182.01   -> "Bio-conversion"
     "Wave"                      ->      19.013   -> "Electricity grid"
     "Wind"                      ->      289.366  -> "Electricity grid"
-  </pre>
+  </pre
+    >
 
-  <script type="module">
-    import mermaid from './mermaid.esm.mjs';
-    mermaid.initialize({
-      theme: 'default',
-      logLevel: 3,
-      securityLevel: 'loose',
-      flowchart: { curve: 'basis' },
-      gantt: { axisFormat: '%m/%d/%Y' },
-      sequence: { actorMargin: 50 },
-    });
-  </script>
-</body>
-
-</html>
\ No newline at end of file
+    <script type="module">
+      import mermaid from './mermaid.esm.mjs';
+      mermaid.initialize({
+        theme: 'default',
+        logLevel: 3,
+        securityLevel: 'loose',
+        flowchart: { curve: 'basis' },
+        gantt: { axisFormat: '%m/%d/%Y' },
+        sequence: { actorMargin: 50 },
+      });
+    </script>
+  </body>
+</html>
diff --git a/run b/run
index 473c6aaff..0f9c451d9 100755
--- a/run
+++ b/run
@@ -47,6 +47,7 @@ Run commonly used commands within docker containers
 \033[1m$name dev\033[0m             # Run dev server with examples, open http://localhost:9000
 
 $name add             # Add package, 'run add d3-sankey'
+$name prettier        # Prettify a file 'run prettier <path-to-file>'
 $name lint            # Equvalent of pnpm -w run lint:fix
 $name test            # Run unit tests
 $name vitest          # Run watcher for unit tests
@@ -65,4 +66,4 @@ echo -n -e "$usage"
 $name help
 ;;
 
-esac
\ No newline at end of file
+esac
