diff --git a/database/migrations/2021_05_01_185503_add_sub_field_to_words_table.php b/database/migrations/2021_05_01_185503_add_sub_field_to_words_table.php
new file mode 100644
index 0000000..fbf84f2
--- /dev/null
+++ b/database/migrations/2021_05_01_185503_add_sub_field_to_words_table.php
@@ -0,0 +1,32 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+class AddSubFieldToWordsTable extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::table('words', function (Blueprint $table) {
+            $table->boolean('sub')->default(false)->after('phrase_id');
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        Schema::table('words', function (Blueprint $table) {
+            $table->dropColumn('sub');
+        });
+    }
+}