Grammar

CONTRIBUTING.md

@@ -1,7 +1,7 @@
 How to contrubute to SunPy
 --------------------------
 
-SunPy is a open project that enourages everyone to contribute in any way possible.
+SunPy is an open project that enourages everyone to contribute in any way possible.
 This document descibes how to contribute code and documentation to the main SunPy 
 repository, if you wish to make a different contribution please contact the 
 [mailing list](https://groups.google.com/forum/#!forum/sunpy).
@@ -24,7 +24,7 @@ For the code to be accepted into SunPy it must meet the following criteria:
 * Conform to code quality standards, primarily [PEP8](http://legacy.python.org/dev/peps/pep-0008/).
 * Have close to 100% unit test coverage.
 * Have API documentation generated by astropy's automodapi extenstion where appropriate.
-* Contain a entry in the CHANGELOG.md file.
+* Contain an entry in the CHANGELOG.md file.
 * Be approved by at least two SunPy contributors.
 
 ## More Information