Adds minor grammar fixes that involve missing commas.
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index aa155969d..63e9188c2 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -20,7 +20,7 @@ your local changes are appropriate to pull back into the original guidelines, pl
 [Issue](https://github.com/isocpp/CppCoreGuidelines/issues) which can lead to a pull request.
 - **Maintain the Guidelines** The C++ Core Guidelines were created from a wealth of knowledge spread across a number of organizations
 worldwide. If you or your organization is passionate about helping to create the guidelines consider becoming an editor or maintainer. If
-you're a C++ expert who is serious about participating please 
+you're a C++ expert who is serious about participating, please 
 [email coreguidelines@isocpp.org](mailto:coreguidelines@isocpp.org?subject=Maintain the C++ Code Guidelines).
  
 ## Contributor License Agreement
@@ -28,10 +28,10 @@ By contributing content to the C++ Core Guidelines (i.e., submitting a pull requ
 [Standard C++ Foundation](https://isocpp.org/about) [Terms of Use](https://isocpp.org/home/terms-of-use), especially all of the terms specified
 regarding Copyright and Patents.   
 - You warrant that your material is original, or you have the right to contribute it.
-- With respect to the material that you own, you grant a worldwide non-exclusive irrevocable transferable royalty-free license to your contributed 
-material to Standard C++ Foundation to display, reproduce, perform, distribute and create derivative works of that material for commercial or 
+- With respect to the material that you own, you grant a worldwide, non-exclusive, irrevocable, transferable, and royalty-free license to your contributed 
+material to Standard C++ Foundation to display, reproduce, perform, distribute, and create derivative works of that material for commercial or 
 non-commercial use. With respect to any other material you contribute, such material must be under a license sufficient to allow Standard C++ Foundation
-to display, reproduce, perform, distribute and create derivative works of that material for commercial or non-commercial use.
+to display, reproduce, perform, distribute, and create derivative works of that material for commercial or non-commercial use.
 - You agree that, if your contributed material is subsequently reflected in the ISO/IEC C++ standard in any form, it will be subject to all ISO/IEC JTC 
 1 policies including [copyrights](http://www.iso.org/iso/home/policies.htm), 
 [patents](http://www.iso.org/iso/home/standards_development/governance_of_technical_work/patents.htm), and 
