diff --git a/markdown.php b/markdown.php
index 2d53dd2..4c5f185 100644
--- a/markdown.php
+++ b/markdown.php
@@ -45,6 +45,8 @@ class markdown
   /** Search and replace in the paragraph on one line */
   private function searchReplace ($line)
   {
+    if ($this->debug)
+      echo "CALL searchReplace ($line)\n";
     $search = array ();
     $replace = array ();
     // Titles short