diff --git a/docs/advanced/ssl.md b/docs/advanced/ssl.md
index da40ed28..3aa8d116 100644
--- a/docs/advanced/ssl.md
+++ b/docs/advanced/ssl.md
@@ -99,3 +99,7 @@ If you do need to make HTTPS connections to a local server, for example to test
 ctx = ssl.create_default_context(cafile="client.pem")
 client = httpx.Client(verify=ctx)
 ```
+
+### SSL context performance issues
+
+It takes about 20ms to create an SSL context. While the default SSL context is cached, this issue is impactful if creating a number of clients (contexts) with a custom SSL context. It is recommended to reuse the same client in this case.