Add commas

api-keys-rate-limits.md

@@ -19,7 +19,7 @@ Mapzen Search allows you a maximum of:
 If you need more capacity, contact [search@mapzen.com](mailto:search@mapzen.com). You can also set up your own instance of [Pelias](https://github.com/pelias/pelias), which has access to the same data used in Mapzen Search.
 
 ## Failing to provide an `api_key`
-If you fail to supply the `api_key` parameter the service will respond with the status code `403 Forbidden`:
+If you fail to supply the `api_key` parameter, the service will respond with the status code `403 Forbidden`:
 ```bash
 {
   "meta": {
@@ -36,7 +36,7 @@ If you fail to supply the `api_key` parameter the service will respond with the
 ```
 
 ## Exceeding your limits
-If you exceed your limits the service will respond with the status code `429 Too Many Requests`:
+If you exceed your limits, the service will respond with the status code `429 Too Many Requests`:
 ```bash
 {
   "meta": {