diff --git a/docs/readme.md b/docs/readme.md
index e498dadc..b57d6ea5 100644
--- a/docs/readme.md
+++ b/docs/readme.md
@@ -86,11 +86,15 @@ As an example, we can implement a custom logger:
 const createClient = require('hafas-client')
 const dbProfile = require('hafas-client/p/db')
 
-const logRequest = (ctx, fetchRequest) => {
+const logRequest = (ctx, fetchRequest, requestId) => {
 	// ctx looks just like with the other profile.* hooks:
 	const {profile, opt} = ctx
 
-	console.debug(fetchRequest.headers, fetchRequest.body + '')
+	console.debug(requestId, fetchRequest.headers, fetchRequest.body + '')
+}
+
+const logResponse = (ctx, fetchResponse, body, requestId) => {
+	console.debug(requestId, fetchResponse.headers, body + '')
 }
 
 // create a client with Deutsche Bahn profile that debug-logs
@@ -103,7 +107,7 @@ const client = createClient({
 
 ```js
 // logRequest output:
-{
+'29d0e3' {
 	accept: 'application/json',
 	'accept-encoding': 'gzip, br, deflate',
 	'content-type': 'application/json',
@@ -111,7 +115,7 @@ const client = createClient({
 	'user-agent': 'hafas842c51-clie842c51nt debug C842c51LI'
 } {"lang":"de","svcReqL":[{"cfg":{"polyEnc":"GPA"},"meth":"LocMatch",…
 // logResponse output:
-{
+'29d0e3' {
 	'content-encoding': 'gzip',
 	'content-length': '1010',
 	'content-type': 'application/json; charset=utf-8',
diff --git a/lib/default-profile.js b/lib/default-profile.js
index 973545cd..f4cd7406 100644
--- a/lib/default-profile.js
+++ b/lib/default-profile.js
@@ -49,10 +49,10 @@ const filters = require('../format/filters')
 
 const DEBUG = /(^|,)hafas-client(,|$)/.test(process.env.DEBUG || '')
 const logRequest = DEBUG
-	? (_, req) => console.error(req.body + '')
+	? (_, req, reqId) => console.error(req.body + '')
 	: () => {}
 const logResponse = DEBUG
-	? (_, res, body) => console.error(body)
+	? (_, res, body, reqId) => console.error(body)
 	: () => {}
 
 const id = (ctx, x) => x
diff --git a/lib/request.js b/lib/request.js
index edc8203b..5faf6293 100644
--- a/lib/request.js
+++ b/lib/request.js
@@ -123,9 +123,10 @@ const request = (ctx, userAgent, reqData) => {
 		}
 	}
 
+	const reqId = randomBytes(3).toString('hex')
 	const url = profile.endpoint + '?' + stringify(req.query)
 	const fetchReq = new Request(url, req)
-	profile.logRequest(ctx, fetchReq)
+	profile.logRequest(ctx, fetchReq, reqId)
 
 	// Async stack traces are not supported everywhere yet, so we create our own.
 	const err = new Error()
@@ -154,7 +155,7 @@ const request = (ctx, userAgent, reqData) => {
 
 		return res.text()
 		.then((body) => {
-			profile.logResponse(ctx, res, body)
+			profile.logResponse(ctx, res, body, reqId)
 			const b = JSON.parse(body)
 
 			if (b.err && b.err !== 'OK') {