diff --git a/plugin.php b/plugin.php
index 3a2145e..22a90d3 100644
--- a/plugin.php
+++ b/plugin.php
@@ -313,7 +313,23 @@ function filter_headings_recursive($blocks)
                 }
             }
 
-            if (isset($blocks['blockName']) && ($blocks['blockName'] === 'generateblocks/headline') && $innerBlock !== 'core/heading') {
+            $supported_third_party_blocks = array(
+                'generateblocks/headline', /* GenerateBlocks 1.x */
+                'generateblocks/text', /* GenerateBlocks 2.0 */
+            );
+
+            /**
+             * Filter to add supported third party blocks.
+             *
+             * @param array $supported_third_party_blocks The array of supported third party blocks.
+             * @return array The modified array of supported third party blocks.
+             */
+            $supported_third_party_blocks = apply_filters(
+                'simpletoc_supported_third_party_blocks',
+                $supported_third_party_blocks
+            );
+
+            if (isset($blocks['blockName']) && in_array($blocks['blockName'], $supported_third_party_blocks) && $innerBlock !== 'core/heading') {
                 // make sure it's a headline.
                 if (preg_match("/(<h1|<h2|<h3|<h4|<h5|<h6)/i", $innerBlock)) {
                     $arr[] = $innerBlock;