README.md in barometer-0.9.6 vs README.md in barometer-0.9.7

- old
+ new
@@ -81,12 +81,12 @@
 ### Sources
 
 The current available sources are:
 
 * Wunderground.com (:wunderground) [default]
-* Yahoo! Weather (:yahoo)
+* Yahoo! Weather (:yahoo) [requires [barometer-yahoo gem](https://github.com/attack/barometer-yahoo)]]
 * WeatherBug.com (:weather_bug) [requires key + [barometer-weather_bug gem](https://github.com/attack/barometer-weather_bug)]]
-* NOAA (:noaa)
+* NOAA (:noaa) [requires [barometer-noaa gem](https://github.com/attack/barometer-noaa)]]
 * Forecast.io (:forecast_io) [requires key + [barometer-forecast_io gem](https://github.com/attack/barometer-forecast_io)]
 
 ### Source Configuration
 
 Barometer can be configured to use multiple weather service APIs (either in