diff --git a/README.Rmd b/README.Rmd
index 72db971..699c8e5 100644
--- a/README.Rmd
+++ b/README.Rmd
@@ -22,7 +22,7 @@ Inspired by [this SO question](http://stackoverflow.com/questions/37061873/ident
 
 NOTE: Requires [`libtidy`](http://www.html-tidy.org/) and presently is super-basic (no way to set options and pretty much only does HTML)
 
-You'll need to first do a `brew install tidy-html5` on MacOS or `apt-get install libtidy-dev` on Ubuntu/Debian to get this to work.
+You'll need to first do a `brew install tidy-html5` on MacOS or `apt-get install libtidy-dev` on Ubuntu/Debian to get this to work. NOTE that the linux libraries may be older and return slightly different (but no less tidy) HTML.
 
 **SEEKING COLLABORATORS**
 
diff --git a/README.md b/README.md
index cd52753..083b4cc 100644
--- a/README.md
+++ b/README.md
@@ -6,7 +6,7 @@ Inspired by [this SO question](http://stackoverflow.com/questions/37061873/ident
 
 NOTE: Requires [`libtidy`](http://www.html-tidy.org/) and presently is super-basic (no way to set options and pretty much only does HTML)
 
-You'll need to first do a `brew install tidy-html5` on MacOS or `apt-get install libtidy-dev` on Ubuntu/Debian to get this to work.
+You'll need to first do a `brew install tidy-html5` on MacOS or `apt-get install libtidy-dev` on Ubuntu/Debian to get this to work. NOTE that the linux libraries may be older and return slightly different (but no less tidy) HTML.
 
 **SEEKING COLLABORATORS**