diff --git a/NEWS b/NEWS
index d9f213a..d96c6f0 100644
--- a/NEWS
+++ b/NEWS
@@ -60,6 +60,7 @@ https://github.com/sp1ff/scribbu/issues/4
 
 ** New Features
 
+*** class `comments` is now mutable
 *** updated the default pretty-printer to list the language field
 *** updated the manual
 
diff --git a/scribbu/charsets.cc b/scribbu/charsets.cc
index 6dc44d8..d3d88c1 100644
--- a/scribbu/charsets.cc
+++ b/scribbu/charsets.cc
@@ -23,6 +23,7 @@
 
 #include "charsets.hh"
 
+#include <bits>
 #include <unordered_map>
 #include <unordered_set>