diff --git a/src/main.ts b/src/main.ts
index d750406..d6498e7 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -23,8 +23,11 @@ export default class TableBeautifierPlugin extends Plugin {
     this.addCommand({
       id: "convert-table-to-markdown",
       name: "Convert table to Markdown",
-      editorCallback: (editor: Editor) => {
-        convertSelection(editor);
+      editorCheckCallback: (checking: boolean, editor: Editor) => {
+        const selection = editor.getSelection();
+        if (!selection || !looksLikeTable(selection)) return false;
+        if (!checking) convertSelection(editor);
+        return true;
       },
     });