diff --git a/FAQ.md b/FAQ.md
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@@ -1,3 +1,13 @@
+- How is the filter created?
+	1. Grab the URLhaus database dump and save it to [URLhaus.csv](https://gitlab.com/curben/urlhaus-filter/blob/master/src/URLhaus.csv).
+	2. Extract the domains.
+	3. Remove offline domains, popular domains ([Umbrella Popularity List](https://s3-us-west-1.amazonaws.com/umbrella-static/index.html)) and more well-known domains (if not listed by Umbrella, see [exclude.txt](https://gitlab.com/curben/urlhaus-filter/blob/master/src/exclude.txt)).
+	4. Extract the URLs (from step 1) that include popular domains (Umbrella and exclude.txt).
+	5. Merge the files from step 3 and 4.
+
+- Why there is an issue running the scripts locally?
+	+ Install **dos2unix** or use `busybox dos2unix` if BusyBox is already installed (like Ubuntu).
+
 - Can you add this *very-bad-url.com* to the filter?
 	+ No, please report to the [upstream](https://urlhaus.abuse.ch/api/#submit).