diff --git a/README b/README
index ca26261..d26c879 100644
--- a/README
+++ b/README
@@ -16,7 +16,7 @@
 	Currently only inspects the following headers: Range, If-Range,
 	If-Unmodified-Since, If-Modified-Since, Date, Accept-Encoding,
 	Accept-Language, Accept-Charset, Max-Forwards, If-Match,
-	If-None-Match, Last-Modified, Content-Length
+	If-None-Match, Last-Modified, Content-Length, Expires
 
 Report Bugs
 	Create a ticket on the issue tracking interface of GitHub:
diff --git a/ngx_http_header_inspect.c b/ngx_http_header_inspect.c
index 731d07b..18b188a 100644
--- a/ngx_http_header_inspect.c
+++ b/ngx_http_header_inspect.c
@@ -1209,6 +1209,11 @@
 					if ((rc != NGX_OK) && conf->block) {
 						return NGX_HTTP_BAD_REQUEST;
 					}
+				} else if ((h[i].key.len == 7) && (ngx_strcmp("Expires", h[i].key.data) == 0) ) {
+					rc = ngx_header_inspect_date_header(conf, r->connection->log, "Expires", h[i].value);
+					if ((rc != NGX_OK) && conf->block) {
+						return NGX_HTTP_BAD_REQUEST;
+					}
 				} else if ((h[i].key.len == 13) && (ngx_strcmp("Last-Modified", h[i].key.data) == 0) ) {
 					rc = ngx_header_inspect_date_header(conf, r->connection->log, "Last-Modified", h[i].value);
 					if ((rc != NGX_OK) && conf->block) {