diff --git a/linkchecker.module b/linkchecker.module
index a3a1a8b..448bb2f 100644
--- a/linkchecker.module
+++ b/linkchecker.module
@@ -1068,10 +1068,7 @@ function _linkchecker_extract_node_links($node, $return_field_names = FALSE) {
 
   // Return either the array of links, or an array of field names containing
   // each link, depending on what was requested.
-  if (!$return_field_names) {
-    return $links;
-  }
-  else {
+  if ($return_field_names) {
     $field_names = array();
     foreach ($text_items_by_field as $field_name => $items) {
       foreach ($items as $item) {
@@ -1095,9 +1092,16 @@ function _linkchecker_extract_node_links($node, $return_field_names = FALSE) {
         }
       }
     }
-
-    return $field_names;
+    $links = $field_names;
   }
+
+  $context = array(
+    'return_field_names' => $return_field_names,
+    'path' => $path,
+  );
+  drupal_alter('linkchecker_node_links', $links, $node, $context);
+
+  return $links;
 }
 
 /**
@@ -1204,6 +1208,11 @@ function _linkchecker_add_comment_links($comment, $skip_missing_links_detection
   // Extract all links in a comment.
   $links = array_keys(_linkchecker_extract_links(implode(' ', $text_items), $path));
 
+  $context = array(
+    'path' => $path,
+  );
+  drupal_alter('linkchecker_comment_links', $links, $comment, $context);
+
   // Comment have links.
   if (!empty($links)) {
     // Remove all links from the links array already in the database and only
@@ -1308,6 +1317,8 @@ function _linkchecker_add_block_custom_links($block_custom, $bid, $skip_missing_
   // Extract all links in a custom block.
   $links = array_keys(_linkchecker_extract_links(implode(' ', $text_items)));
 
+  drupal_alter('linkchecker_block_links', $links, $block_custom);
+
   // Custom block has links.
   if (!empty($links)) {
     // Remove all links from the links array already in the database and only