diff --git a/src/htmltidy.cpp b/src/htmltidy.cpp
index 7136d2c..1d760c9 100644
--- a/src/htmltidy.cpp
+++ b/src/htmltidy.cpp
@@ -2,8 +2,12 @@
 #include <tidy.h>
 #include <tidybuffio.h>
 
+// libtidy docs:
 // http://api.html-tidy.org/tidy/tidylib_api_5.2.0/tidyenum_8h.html#a3a1401652599150188a168dade7dc150
 
+// NOTE: cannot do "using namespace Rcpp;" b/c of annoying warnings about the
+//       ambiguity of 'yes'.
+
 //' Tidy HTML/XML
 //'
 //' @param source length 1 character vetor containing the HTML/XML source to process