diff --git a/extension.php b/extension.php
index 28a9dd4..e8641bb 100644
--- a/extension.php
+++ b/extension.php
@@ -25,7 +25,7 @@ class KagiSummarizerExtension extends Minz_Extension {
   public function addSummarizeButton(FreshRSS_Entry $entry): FreshRSS_Entry {
     $this->registerTranslates();
 
-    $entry->_content('<p class="kagi-summary"><a class="btn" onclick="documentReady(); return false;" href="#">' . _t('ext.kagiSummarizer.ui.summarize_button') . '</a></p>' . $entry->content());
+    $entry->_content('<p class="kagi-summary"><a class="btn" onClick="documentReady(); return false;" href="#">' . _t('ext.kagiSummarizer.ui.summarize_button') . '</a></p>' . $entry->content());
     return $entry;
   }
 }