diff --git a/README.md b/README.md
index fed435f..9ac7577 100644
--- a/README.md
+++ b/README.md
@@ -208,7 +208,8 @@ const options: EventSourceOptions = {
   body: undefined, // Your request body sent on connection. Default: undefined
   debug: false, // Show console.debug messages for debugging purpose. Default: false
   pollingInterval: 5000, // Time (ms) between reconnections. If set to 0, reconnections will be disabled. Default: 5000
-  lineEndingCharacter: null // Character(s) used to represent line endings in received data. Common values: '\n' for LF (Unix/Linux), '\r\n' for CRLF (Windows), '\r' for CR (older Mac). Default: null (Automatically detect from event)
+  lineEndingCharacter: null, // Character(s) used to represent line endings in received data. Common values: '\n' for LF (Unix/Linux), '\r\n' for CRLF (Windows), '\r' for CR (older Mac). Default: null (Automatically detect from event)
+  lastEventId: null // `Last-Event-ID` request header sent on initial connection. Default null.
 }
 ```
 
diff --git a/index.d.ts b/index.d.ts
index 4820cc4..f50cf4e 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -54,6 +54,7 @@ export interface EventSourceOptions {
   debug?: boolean;
   pollingInterval?: number;
   lineEndingCharacter?: string;
+  lastEventId?: string;
 }
 
 type BuiltInEventMap = {
diff --git a/src/EventSource.js b/src/EventSource.js
index 8b2991d..66bff38 100644
--- a/src/EventSource.js
+++ b/src/EventSource.js
@@ -11,7 +11,6 @@ class EventSource {
   CR = '\r';
 
   constructor(url, options = {}) {
-    this.lastEventId = null;
     this.status = this.CONNECTING;
 
     this.eventHandlers = {
@@ -30,6 +29,7 @@ class EventSource {
     this.debug = options.debug || false;
     this.interval = options.pollingInterval ?? 5000;
     this.lineEndingCharacter = options.lineEndingCharacter || null;
+    this.lastEventId = options.lastEventId || null;
 
     const defaultHeaders = {
       Accept: 'text/event-stream',