Update usage.md

docs/usage.md

@@ -4,7 +4,9 @@
 
 Fetch your Google Scholar ID, which is the string of letters and numbers in the URL of your Google Scholar profile page between `user=` and `&hl=`.
 
-## Example
+## Examples
+
+If generating an NSF COA report, all you need to do is the following:
 
 ```python
 from coapy.scholar import get_coauthors
@@ -13,3 +15,16 @@ scholar_id = "lHBjgLsAAAAJ" # Google Scholar ID
 my_coauthors = get_coauthors(scholar_id=scholar_id)
 print(my_coauthors)
 ```
+
+If for any reason you need to get >2 years of data, this can be modified as follows:
+
+
+## Example
+
+```python
+from coapy.scholar import get_coauthors
+
+scholar_id = "lHBjgLsAAAAJ" # Google Scholar ID
+my_coauthors = get_coauthors(scholar_id=scholar_id, years_back=4)
+print(my_coauthors)
+```