Included note mentioning which OBD it will work with.

docs/index.md

@@ -1,6 +1,8 @@
 # Welcome
 
-Python-OBD is a library for handling data from a car's [**O**n-**B**oard **D**iagnostics port](https://en.wikipedia.org/wiki/On-board_diagnostics) (OBD-II). It can stream real time sensor data, perform diagnostics (such as reading check-engine codes), and is fit for the Raspberry Pi. This library is designed to work with standard [ELM327 OBD-II adapters](http://www.amazon.com/s/ref=nb_sb_noss?field-keywords=elm327).
+Python-OBD is a library for handling data from a car's [**O**n-**B**oard **D**iagnostics](https://en.wikipedia.org/wiki/On-board_diagnostics) port. Please keep in mind that the car **must** have OBD-II (any car made in 1996 and up); this will _**not**_ work with OBD-I.
+
+Python-OBD can stream real time sensor data, perform diagnostics (such as reading check-engine codes), and is fit for the Raspberry Pi. This library is designed to work with standard [ELM327 OBD-II adapters](http://www.amazon.com/s/ref=nb_sb_noss?field-keywords=elm327).
 
 <span style="color:red">*NOTE: Python-OBD is below 1.0.0, meaning the API may change between minor versions. Consult the [GitHub release page](https://github.com/brendan-w/python-OBD/releases) for changelogs before updating.*</span>
 
@@ -31,13 +33,13 @@ connection = obd.OBD() # auto-connects to USB or RF port
 
 cmd = obd.commands.SPEED # select an OBD command (sensor)
 
-response = connection.query(cmd) # send the command, and parse the response
+response = connection.query(cmd) # send the command and parse the response
 
 print(response.value) # returns unit-bearing values thanks to Pint
 print(response.value.to("mph")) # user-friendly unit conversions
 ```
 
-OBD connections operate in a request-reply fashion. To retrieve data from the car, you must send commands that query for the data you want (e.g. RPM, Vehicle speed, etc). In python-OBD, this is done with the `query()` function. The commands themselves are represented as objects, and can be looked up by name or value in `obd.commands`. The `query()` function will return a response object with parsed data in its `value` property.
+OBD connections operate in a request-reply fashion. To retrieve data from the car, you must send commands that query for the data you want (e.g. RPM, Vehicle speed, etc). In python-OBD this is done with the `query()` function. The commands themselves are represented as objects and can be looked up by name or value in `obd.commands`. The `query()` function will return a response object with parsed data in its `value` property.
 
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