note about ng1 observables

README.md

@@ -49,6 +49,23 @@ angular.module('myApp', ['ionic', 'ionic.native'])
 });
 ```
 
+For services that return observables, the Angular 1 digest cycle must be done manually (currently):
+
+```javascript
+angular.module('myApp', ['ionic', 'ionic.native'])
+
+.controller('MyCtrl', function($scope, $cordovaGeolocation) {
+  $scope.takePicture = function() {
+    $cordovaGeolocation.watchPosition(opts).subscribe(function(p) {
+      $scope.$apply(function() {
+        $scope.position = p.coords;
+      });
+    }, function(err) {
+    });
+  };
+});
+```
+
 ### Runtime Diagnostics
 
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