diff --git a/README.md b/README.md
index 846a57ec..f181f7e9 100644
--- a/README.md
+++ b/README.md
@@ -110,7 +110,12 @@ var orejimeConfig = {
     // defaults to "orejime".
     cookieName: "orejime",
 
-    // Optional. You can set a custom expiration time for the Orejime cookie, in days.
+    // Optional. You can set a custom expiration time for the Orejime cookie, in days,
+    // by using an integer or a function returning an integer.
+    // The function has the following signature: `function cookieExpiresAfterDays (consents, config): integer`
+    //  - consents is an object of apps name defined in `config.apps[].name` with their consent value as a boolean (same as the cookie value).
+    //  - config is your defined configuration (this object).
+    // You can find a snippet function here: https://github.com/empreinte-digitale/orejime/pull/79#issue-1100817288
     // defaults to 365.
     cookieExpiresAfterDays: 365,
 
diff --git a/src/consent-manager.js b/src/consent-manager.js
index d0c40d92..df071c7f 100644
--- a/src/consent-manager.js
+++ b/src/consent-manager.js
@@ -127,11 +127,17 @@ export default class ConsentManager {
 	saveConsents() {
 		if (this.consents === null) deleteCookie(this.cookieName);
 		const value = this.config.stringifyCookie(this.consents);
+		const configCookieExpiresAfterDays = this.config.cookieExpiresAfterDays;
+
+		const cookieExpiresAfterDays =
+			typeof configCookieExpiresAfterDays === 'function'
+				? configCookieExpiresAfterDays(this.consents, this.config)
+				: configCookieExpiresAfterDays || 120;
 
 		setCookie(
 			this.cookieName,
 			value,
-			this.config.cookieExpiresAfterDays || 120,
+			cookieExpiresAfterDays,
 			this.config.cookieDomain
 		);