diff --git a/README.md b/README.md
index 2022717..fa59575 100644
--- a/README.md
+++ b/README.md
@@ -225,7 +225,12 @@ The server applies gzip compression to the following MIME type contents:
   * application/xml
   * application/xhtml+xml
 
+NOTE
+----
+
+g++ 4.8 cannot build this library since `<regex>` in g++4.8 is [broken](https://stackoverflow.com/questions/12530406/is-gcc-4-8-or-earlier-buggy-about-regular-expressions).
+
 License
 -------
 
-MIT license (© 2018 Yuji Hirose)
+MIT license (© 2019 Yuji Hirose)