diff --git a/FAQ.md b/FAQ.md
index e9d9149a..edec9541 100644
--- a/FAQ.md
+++ b/FAQ.md
@@ -264,6 +264,11 @@ To prevent a bad user experience there is a predefined rule to default allow the
 
 You can find all predefined rules [here](https://github.com/M66B/NetGuard/blob/master/app/src/main/res/xml/predefined.xml).
 
+<a name="FAQ29"></a>
+**(29) Why do I get 'The item you requested is not available for purchase'?**
+
+You can only purchase pro feature when you installed NetGuard from the Play store.
+
 <br />
 
 **If you didn't find the answer to your question, you can ask your questions [here](http://forum.xda-developers.com/showthread.php?t=3233012)**.
diff --git a/README.md b/README.md
index 15dc0a01..6d4103a5 100644
--- a/README.md
+++ b/README.md
@@ -182,6 +182,9 @@ Frequently Asked Questions (FAQ)
 <a name="FAQ28"></a>
 [**(28) Why is Google connectivity services allowed internet access by default?**](https://github.com/M66B/NetGuard/blob/master/FAQ.md#FAQ28)
 
+<a name="FAQ29"></a>
+[**(29) Why do I get 'The item you requested is not available for purchase'?**](https://github.com/M66B/NetGuard/blob/master/FAQ.md#FAQ29)
+
 Permissions
 -----------