diff --git a/java_tools/ts_plugin/src/main/java/com/rusefi/ts_plugin/IntegerDocumentFilter.java b/java_tools/ts_plugin/src/main/java/com/rusefi/ts_plugin/IntegerDocumentFilter.java
new file mode 100644
index 0000000000..bcb030f65b
--- /dev/null
+++ b/java_tools/ts_plugin/src/main/java/com/rusefi/ts_plugin/IntegerDocumentFilter.java
@@ -0,0 +1,69 @@
+package com.rusefi.ts_plugin;
+
+import javax.swing.*;
+import javax.swing.text.*;
+
+public class IntegerDocumentFilter extends DocumentFilter {
+    public static void install(JTextField jTextField) {
+        PlainDocument doc = (PlainDocument) jTextField.getDocument();
+        doc.setDocumentFilter(new IntegerDocumentFilter());
+    }
+
+    @Override
+    public void insertString(FilterBypass fb, int offset, String string,
+                             AttributeSet attr) throws BadLocationException {
+
+        Document doc = fb.getDocument();
+        StringBuilder sb = new StringBuilder();
+        sb.append(doc.getText(0, doc.getLength()));
+        sb.insert(offset, string);
+
+        if (test(sb.toString())) {
+            super.insertString(fb, offset, string, attr);
+        } else {
+            // warn the user and don't allow the insert
+        }
+    }
+
+    private boolean test(String text) {
+        try {
+            Integer.parseInt(text);
+            return true;
+        } catch (NumberFormatException e) {
+            return false;
+        }
+    }
+
+    @Override
+    public void replace(FilterBypass fb, int offset, int length, String text,
+                        AttributeSet attrs) throws BadLocationException {
+
+        Document doc = fb.getDocument();
+        StringBuilder sb = new StringBuilder();
+        sb.append(doc.getText(0, doc.getLength()));
+        sb.replace(offset, offset + length, text);
+
+        if (test(sb.toString())) {
+            super.replace(fb, offset, length, text, attrs);
+        } else {
+            // warn the user and don't allow the insert
+        }
+
+    }
+
+    @Override
+    public void remove(FilterBypass fb, int offset, int length)
+            throws BadLocationException {
+        Document doc = fb.getDocument();
+        StringBuilder sb = new StringBuilder();
+        sb.append(doc.getText(0, doc.getLength()));
+        sb.delete(offset, offset + length);
+
+        if (test(sb.toString())) {
+            super.remove(fb, offset, length);
+        } else {
+            // warn the user and don't allow the insert
+        }
+
+    }
+}
diff --git a/java_tools/ts_plugin/src/main/java/com/rusefi/ts_plugin/RemoteTab.java b/java_tools/ts_plugin/src/main/java/com/rusefi/ts_plugin/RemoteTab.java
index 4104d0e008..fb85388755 100644
--- a/java_tools/ts_plugin/src/main/java/com/rusefi/ts_plugin/RemoteTab.java
+++ b/java_tools/ts_plugin/src/main/java/com/rusefi/ts_plugin/RemoteTab.java
@@ -57,9 +57,13 @@ public class RemoteTab {
                 return new Dimension(100, size.height);
             }
         };
+        IntegerDocumentFilter.install(applicationPort);
+        IntegerDocumentFilter.install(oneTimePasswordControl);
         String portProperty = getLocalPort();
         applicationPort.setText(portProperty);
 
+        JPanel topLines = new JPanel(new VerticalFlowLayout());
+
 
         JPanel topPanel = new JPanel(new FlowLayout());
         topPanel.add(refresh);
@@ -67,7 +71,11 @@ public class RemoteTab {
         topPanel.add(applicationPort);
         topPanel.add(new JLabel("   One time password:"));
         topPanel.add(oneTimePasswordControl);
-        content.add(topPanel, BorderLayout.NORTH);
+
+        topLines.add(topPanel);
+        topLines.add(new URLLabel("https://github.com/rusefi/rusefi/wiki/HOWTO-Remote-Tuning"));
+
+        content.add(topLines, BorderLayout.NORTH);
         content.add(list, BorderLayout.CENTER);
         list.add(new JLabel("Requesting list of ECUs"));
         requestListDownload();