Update README.md

JoeH-CGI · Mar 25, 2020 · 662f19a · 662f19a
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@@ -160,6 +160,14 @@ supports two way data binding as well
 [(page)]="pageVariable"
 ```
 
+If you want that the `two way data binding` actually updates your `page` variable on page change/scroll - you have to be sure that you define the hight of the container, for example:
+```
+pdf-viewer {
+    display: block;
+    height: 100vh;
+}
+```
+
 #### [stick-to-page]
 
 | Property | Type | Required |