diff --git a/collects/net/cookie.rkt b/collects/net/cookie.rkt
index 3600bd844c..c2a8d9a1bc 100644
--- a/collects/net/cookie.rkt
+++ b/collects/net/cookie.rkt
@@ -61,6 +61,7 @@
  cookie:add-comment
  cookie:add-domain
  cookie:add-max-age
+ cookie:add-expires
  cookie:add-path
  cookie:secure
  cookie:version
@@ -73,7 +74,7 @@
  (struct-out cookie-error))
 
 (define-serializable-struct cookie
-  (name value comment domain max-age path secure version) #:mutable)
+  (name value comment domain max-age path secure version expires) #:mutable)
 (define-struct (cookie-error exn:fail) ())
 
 ;; error* : string args ... -> raises a cookie-error exception
@@ -92,6 +93,7 @@
 ;; cookie-av       =       "Comment" "=" value
 ;;                  |       "Domain" "=" value
 ;;                  |       "Max-Age" "=" value
+;;                  |       "Expires" "=" value
 ;;                  |       "Path" "=" value
 ;;                  |       "Secure"
 ;;                  |       "Version" "=" 1*DIGIT
@@ -106,6 +108,7 @@
                  #f ; current path
                  #f ; normal (non SSL)
                  #f ; default version
+                 #f ; doesn't expire
                  )))
 
 ;;!
@@ -127,7 +130,8 @@
                  (format-if "Max-Age=~a" (cookie-max-age cookie))
                  (format-if "Path=~a" (cookie-path cookie))
                  (and (cookie-secure cookie) "Secure")
-                 (format "Version=~a" (or (cookie-version cookie) 1))))
+                 (format "Version=~a" (or (cookie-version cookie) 1))
+                 (format-if "expires=~a" (cookie-expires cookie))))
    "; "))
 
 (define (cookie:add-comment cookie pre-comment)
@@ -145,6 +149,14 @@
   (set-cookie-domain! cookie domain)
   cookie)
 
+(define (cookie:add-expires cookie expires)
+  (unless (string? expires)
+    (error* "invalid expires: ~a" expires))
+  (unless (cookie? cookie)
+    (error* "cookie expected, received: ~a" cookie))
+  (set-cookie-expires! cookie expires)
+  cookie)
+
 (define (cookie:add-max-age cookie seconds)
   (unless (and (integer? seconds) (not (negative? seconds)))
     (error* "invalid Max-Age for cookie: ~a" seconds))
diff --git a/collects/net/scribblings/cookie.scrbl b/collects/net/scribblings/cookie.scrbl
index 59ee053eee..5cda30cb48 100644
--- a/collects/net/scribblings/cookie.scrbl
+++ b/collects/net/scribblings/cookie.scrbl
@@ -64,6 +64,12 @@ that a client should retain the cookie.}
 Modifies @racket[cookie] with a path, and also returns
 @racket[cookie].}
 
+@defproc[(cookie:add-expires [cookie cookie?] [path string])
+         cookie?]{
+
+Modifies @racket[cookie] with an expiration, and also returns
+@racket[cookie].}
+
 @defproc[(cookie:secure [cookie cookie?] [secure boolean?])
          cookie?]{