diff --git a/docs/style-guide.rst b/docs/style-guide.rst
index 0c58f3eb8405..08dbb5cd817f 100644
--- a/docs/style-guide.rst
+++ b/docs/style-guide.rst
@@ -931,4 +931,10 @@ built-in or otherwise reserved name.
 General Recommendations
 =======================
 
-TODO
+* Function parameter variable names
+
+It's convention to start function parameter variable names with an underscore (``_``) in order to differentiate them from global variables. e.g. ``function myFunction(_foo, _bar) {  }``
+
+* Private functions
+
+It's convention to start private function names with an underscore (``_``). e.g. ``_myPrivateFunction``