Update README.md

Author: mvcisback

README.md

@@ -33,8 +33,8 @@ import mtl
 ```
 
 There are **two** APIs for interacting with the `mtl` module. Namely, one can specify the MTL expression using:
-1. python operators.
-2. string + the parse api.
+1. [Python Operators][#python-operator-api].
+2. [Strings + The parse API][#string-based-api].
 
 We begin with the Python Operator API: