diff --git a/fastlib/u/dongryel/series_expansion/kernel_aux.h b/fastlib/u/dongryel/series_expansion/kernel_aux.h
index b6e3d7ded6..69b7f55663 100644
--- a/fastlib/u/dongryel/series_expansion/kernel_aux.h
+++ b/fastlib/u/dongryel/series_expansion/kernel_aux.h
@@ -5,7 +5,7 @@
  * functions (derivative, truncation error bound)
  *
  * @author Dongryeol Lee (dongryel)
- * @bugs No known bugs.
+ * @bug No known bugs.
  */
 
 #ifndef KERNEL_AUX