diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -1,3 +1,29 @@
 # proxy-pac-file
 
-Proxy PAC file that can be used to access the sites of publishers that require a CNR subscription.
\ No newline at end of file
+Proxy PAC file that can be used to access the sites of publishers that require a CNR subscription.  
+This way, users can access content that would normally require authentication, as if they were on the internal CNR network.  
+**Requirement:** VPN must be connected.
+
+## Configuration
+The only configuration needed is to specify in the browser settings the permanent address of the _raw_ PAC file: [https://gitea-s2i2s.isti.cnr.it/ISTI-Applicazioni/proxy-pac-file/raw/branch/main/proxy-isti.pac](https://gitea-s2i2s.isti.cnr.it/ISTI-Applicazioni/proxy-pac-file/raw/branch/main/proxy-isti.pac)  
+Any update to the online file will be automatically acquired at browser startup.  
+
+### Firefox
+* Open **Menu** and then **Settings**
+* Navigate to **Network Settings** and click **Settings**
+* Enable **Automatic proxy configuration URL** and in the underlying area specify **https://gitea-s2i2s.isti.cnr.it/ISTI-Applicazioni/proxy-pac-file/raw/branch/main/proxy-isti.pac**
+* Click **OK** and restart your browser to apply the changes
+
+### Chrome
+* Open **Menu** and then **Settings**
+* Click **Advanced** and then **System**
+* Click **Open your computer's proxy settings**
+* Enable **Use setup script** and specify **https://gitea-s2i2s.isti.cnr.it/ISTI-Applicazioni/proxy-pac-file/raw/branch/main/proxy-isti.pac**
+* Click **Save** to save the configuration
+
+### Safari
+* Open **Menu** and click **Preferences...**
+* Click **Advanced**
+* In the **Advanced tab**, go to **Proxies** and click **Change Settings...**
+* Select **Automatic proxy configuration** and in the URL area specify **https://gitea-s2i2s.isti.cnr.it/ISTI-Applicazioni/proxy-pac-file/raw/branch/main/proxy-isti.pac**
+* Click **OK** and restart your browser to apply the changes 
diff --git a/proxy-isti.pac b/proxy-isti.pac
new file mode 100644
index 0000000..d67f1c7
--- /dev/null
+++ b/proxy-isti.pac
@@ -0,0 +1,54 @@
+const site_vector = [
+    /* IEEE */ "https://ieeexplore.ieee.org/*",
+    /* ACM */ "https://dl.acm.org/*",
+    /* SPRINGER */ "https://link.springer.com/*",
+    /* SCIENCE_DIRECT */ "https://www.sciencedirect.com/*",
+    /* WEB_OF_SCIENCE */ "https://www.webofknowledge.com/*",
+    /* WILEY */ "https://onlinelibrary.wiley.com/*",
+    /* NATURE */ "https://www.nature.com/*",
+    /* SAGE */ "https://journals.sagepub.com/*",
+    /* TAYLOR_FRANCIS */ "https://www.tandfonline.com/*",
+    /* MDPI */ "https://www.mdpi.com/*",
+    /* FRONTIERS */ "https://www.frontiersin.org/*",
+    /* MATH SCI NET */ "https://mathscinet.ams.org/*",
+    /* REAXYS */ "https://www.reaxys.com/*",
+    /* OXFORD */ "https://academic.oup.com/*",
+    /* PNAS */ "https://www.pnas.org/*",
+    /* CAMBRIDGE */ "https://www.cambridge.org/*",
+    /* IOP */ "https://iopscience.iop.org/*",
+    /* IOS */ "https://content.iospress.org/*",
+    /* JSTOR */ "https://www.jstor.org/*",
+    /* RSC */ "https://pubs.rsc.org/*",
+    /* CHEM SPIDER */ "https://www.chemspider.com/*",
+    /* CLARIVATE */ "https://jcr.clarivate.com/*",
+    /* CLARIVATE ENDNOTE */ "https://www.myendnoteweb.com/*",
+    /* SCIENTIFIC NET */ "https://www.scientific.net/*",
+    /* AIP */ "https://aip.scitation.org/*",
+    /* APS */ "https://journals.aps.org/*",
+    /* PUBMED */ "https://pubmed.ncbi.nlm.nih.gov/*",
+    /* SCIENCEMAG */ "https://www.sciencemag.org/*",
+    /* SIAM */ "https://epubs.siam.org/*",
+    /* AMERICAN_CHEMICAL */ "https://pubs.acs.org/*",
+    /* AMERICAN_PHYSICAL */ "https://journals.aps.org/*",
+    /* AMERICAN_PHYSICS */ "https://www.scitation.org/*",
+    /* AMERICAN_SOCIETY */ "https://www.asme.org/*",
+    /* AMERICAN_INSTITUTE */ "https://www.aiaa.org/*",
+    /* AMERICAN_MATHEMATICAL */ "https://www.ams.org/*",
+    /* AMERICAN_METEO */ "https://journals.ametsoc.org/*",
+    /* AMERICAN_GEOPHYSICAL */ "https://www.agu.org/*",
+    /* ANNUAL_REVIEWS */ "https://www.annualreviews.org/*",
+    /* RIVISTE WEB */ "https://www.rivisteweb.it/*",
+    /* DARWIN BOOKS */ "https://www.darwinbooks.it/*",
+]; 
+
+function FindProxyForURL(url, host) {
+    // Check if the requested URL is a paper repo
+    for (var i = 0; i < site_vector.length; i++) {
+        if (shExpMatch(url, site_vector[i])) {
+            return "PROXY vpn-proxy.isti.cnr.it:3128";
+        }
+    }
+
+    // Default to direct connection for all other URLs
+    return "DIRECT";
+}