diff --git a/client.go b/client.go
index <HASH>..<HASH> 100644
--- a/client.go
+++ b/client.go
@@ -692,7 +692,7 @@ func (c *Client) DisableTraceAll() *Client {
 	return c
 }
 
-// EnableTraceAll enable trace for all requests.
+// EnableTraceAll enable trace for all requests (http3 currently does not support trace).
 func (c *Client) EnableTraceAll() *Client {
 	c.trace = true
 	return c
diff --git a/request.go b/request.go
index <HASH>..<HASH> 100644
--- a/request.go
+++ b/request.go
@@ -686,7 +686,7 @@ func (r *Request) DisableTrace() *Request {
 	return r
 }
 
-// EnableTrace enables trace.
+// EnableTrace enables trace (http3 currently does not support trace).
 func (r *Request) EnableTrace() *Request {
 	if r.trace == nil {
 		r.trace = &clientTrace{}
declare in the comment that h3 does not support trace yet