diff --git a/docs/gitbook/faq.md b/docs/gitbook/faq.md
index 61e13588..e33905f0 100644
--- a/docs/gitbook/faq.md
+++ b/docs/gitbook/faq.md
@@ -44,6 +44,8 @@ NGINX example:
             exact: "canary"
 ```
 
+Note that the NGINX ingress controller supports only exact matching for a single header and the cookie value is set to `always`.
+
 The above configurations will route users with the x-canary header or canary cookie to the canary instance during analysis:
 
 ```bash