diff --git a/.gitignore b/.gitignore
index 2a2eceb..397b4a7 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1 @@
-*.list
-!websites.list
 *.log
diff --git a/README.md b/README.md
index d6e0a36..d5f4826 100644
--- a/README.md
+++ b/README.md
@@ -27,8 +27,10 @@ That's where this scripts comes in, to generate a list of such subdomains.
 It takes an input a list of websites with trackers included.
 So far, this list is manually-generated from the list of clients of such first-party trackers
 (latter we should use a general list of websites to be more exhaustive).
-
 It open each ones of those websites (just the homepage) in a web browser, and record the domains of the network requests the page makes.
+
+Additionaly, or alternatively, you can feed the script some browsing history and get domains from there.
+
 It then find the DNS redirections of those domains, and compare with regexes of known tracking domains.
 It finally outputs the matching ones.
 
@@ -38,19 +40,43 @@ Just to build the list, you can find an already-built list in the releases.
 
 - Bash
 - Python 3.4+
+- [progressbar2](https://pypi.org/project/progressbar2/)
+- dnspython
+
+(if you don't want to collect the subdomains, you can skip the following) 
+
 - Firefox
 - Selenium
 - seleniumwire
-- dnspython
-- [progressbar2](https://pypi.org/project/progressbar2/)
 
-And then just run `eulaurarien.sh`.
+## Usage
+
+### Add personal sources
+
+The list of websites provided in this script is by no mean exhaustive,
+so adding your own browsing history will help create a better list.
+Here's reference command for possible sources:
+
+- **Pi-hole**: `sqlite3 /etc/pihole-FTL.db "select distinct domain from queries" > /path/to/eulaurarien/subdomains/my-pihole.custom.list`
+- **Firefox**: `cp ~/.mozilla/firefox/<your_profile>.default/places.sqlite temp; sqlite3 temp "select distinct rev_host from moz_places" | rev | sed 's|^\.||' > /path/to/eulaurarien/subdomains/my-firefox.custom.list`
+
+### Collect subdomains from websites
+
+This step is optional if you already added personal sources.
+Just run `collect_subdomain.sh`.
+This is a long step, and might be memory-intensive from time to time.
+
+### Extract tracking domains
+
+Make sure your system is configured with a DNS server without limitation.
+Then, run `filter_subdomain.sh`.
+The files you need will be in the folder `dist`.
 
 ## Contributing
 
 ### Adding websites
 
-Just add them to `websites.list`.
+Just add the URL to the relevant list: `websites/<source>.list`.
 
 ### Adding first-party trackers regex
 
diff --git a/collect_subdomains.sh b/collect_subdomains.sh
new file mode 100755
index 0000000..bd4741a
--- /dev/null
+++ b/collect_subdomains.sh
@@ -0,0 +1,7 @@
+#!/usr/bin/env bash
+
+# Get all subdomains accessed by each website in the website list
+
+cat websites/*.list | sort -u > temp/all_websites.list
+./collect_subdomains.py temp/all_websites.list > temp/subdomains_from_websites.list
+sort -u temp/subdomains_from_websites.list > subdomains/from_websites.cache.list
diff --git a/dist/.gitignore b/dist/.gitignore
new file mode 100644
index 0000000..2211df6
--- /dev/null
+++ b/dist/.gitignore
@@ -0,0 +1 @@
+*.txt
diff --git a/eulaurarien.sh b/eulaurarien.sh
index d6e3a0e..88622f5 100755
--- a/eulaurarien.sh
+++ b/eulaurarien.sh
@@ -2,21 +2,6 @@
 
 # Main script for eulaurarien
 
-# Get all subdomains accessed by each website in the website list
-./collect_subdomains.py websites.list > subdomains.list
-sort -u subdomains.list > subdomains.sorted.list
+./collect_subdomains.sh
+./filter_subdomains.sh
 
-# Filter out the subdomains not pointing to a first-party tracker
-./filter_subdomains.py subdomains.sorted.list > toblock.list
-sort -u toblock.list > toblock.sorted.list
-
-# Format the blocklist so it can be used as a hostlist
-
-(
-    echo "# First party trackers"
-    echo "# List generated on $(date -Isec) by eulaurarien $(git describe --tags --dirty)"
-    cat toblock.sorted.list | while read host;
-    do
-        echo "0.0.0.0 $host"
-    done
-) > toblock.hosts.list
diff --git a/filter_subdomains.sh b/filter_subdomains.sh
new file mode 100755
index 0000000..139af0b
--- /dev/null
+++ b/filter_subdomains.sh
@@ -0,0 +1,18 @@
+#!/usr/bin/env bash
+
+# Filter out the subdomains not pointing to a first-party tracker
+
+cat subdomains/*.list | sort -u > temp/all_subdomains.list
+./filter_subdomains.py temp/all_subdomains.list > temp/all_toblock.list
+sort -u temp/all_toblock.list > dist/firstparty-trackers.txt
+
+# Format the blocklist so it can be used as a hostlist
+
+(
+    echo "# First-party trackers"
+    echo "# List generated on $(date -Isec) by eulaurarien $(git describe --tags --dirty)"
+    cat dist/firstparty-trackers.txt | while read host;
+    do
+        echo "0.0.0.0 $host"
+    done
+) > dist/firstparty-trackers-hosts.txt
diff --git a/regexes.py b/regexes.py
index cb46a8f..11fff4b 100644
--- a/regexes.py
+++ b/regexes.py
@@ -4,6 +4,8 @@
 List of regex matching first-party trackers.
 """
 
+# Syntax: https://docs.python.org/3/library/re.html#regular-expression-syntax
+
 REGEXES = [
     r'^.+\.eulerian\.net\.$',
     r'^.+\.criteo\.com\.$',
diff --git a/subdomains/.gitignore b/subdomains/.gitignore
new file mode 100644
index 0000000..dbd03bc
--- /dev/null
+++ b/subdomains/.gitignore
@@ -0,0 +1,2 @@
+*.custom.list
+*.cache.list
diff --git a/temp/.gitignore b/temp/.gitignore
new file mode 100644
index 0000000..b31be08
--- /dev/null
+++ b/temp/.gitignore
@@ -0,0 +1 @@
+*.list
diff --git a/websites/.gitignore b/websites/.gitignore
new file mode 100644
index 0000000..9f206f1
--- /dev/null
+++ b/websites/.gitignore
@@ -0,0 +1 @@
+*.custom.list
diff --git a/websites.list b/websites/eulerian_clients.list
similarity index 100%
rename from websites.list
rename to websites/eulerian_clients.list