diff --git a/apis/v1alpha1/httproute_types.go b/apis/v1alpha1/httproute_types.go
index 0f02b972be..102b81eb7e 100644
--- a/apis/v1alpha1/httproute_types.go
+++ b/apis/v1alpha1/httproute_types.go
@@ -357,8 +357,9 @@ type HTTPQueryParamMatch struct {
 	// expressions. Please read the implementation's documentation to determine
 	// the supported dialect.
 	//
-	// HTTP query parameter matching MUST be case-sensitive for both keys and
-	// values.
+	// When the Exact QueryParamMatchType is used, HTTP query parameter matching
+	// MUST be case-sensitive for both keys and values. (See
+	// https://tools.ietf.org/html/rfc7230#section-2.7.3).
 	//
 	// +optional
 	// +kubebuilder:default=Exact
@@ -372,6 +373,9 @@ type HTTPQueryParamMatch struct {
 	//
 	// Multiple match values are ANDed together, meaning, a request must match
 	// all the specified query parameters to select the route.
+	//
+	// Note that the query parameter key MUST always be an exact match by string
+	// comparison.
 	Values map[string]string `json:"values"`
 }
 
diff --git a/config/crd/bases/networking.x-k8s.io_httproutes.yaml b/config/crd/bases/networking.x-k8s.io_httproutes.yaml
index 21a4acc24d..cecad3ff5d 100644
--- a/config/crd/bases/networking.x-k8s.io_httproutes.yaml
+++ b/config/crd/bases/networking.x-k8s.io_httproutes.yaml
@@ -739,9 +739,10 @@ spec:
                                   custom conformance, implementations can support
                                   POSIX, PCRE or any other dialects of regular expressions.
                                   Please read the implementation's documentation to
-                                  determine the supported dialect. \n HTTP query parameter
+                                  determine the supported dialect. \n When the Exact
+                                  QueryParamMatchType is used, HTTP query parameter
                                   matching MUST be case-sensitive for both keys and
-                                  values."
+                                  values. (See https://tools.ietf.org/html/rfc7230#section-2.7.3)."
                                 enum:
                                 - Exact
                                 - RegularExpression
@@ -756,7 +757,9 @@ spec:
                                   key, and the value of the query parameter is the
                                   map value. \n Multiple match values are ANDed together,
                                   meaning, a request must match all the specified
-                                  query parameters to select the route."
+                                  query parameters to select the route. \n Note that
+                                  the query parameter key MUST always be an exact
+                                  match by string comparison."
                                 type: object
                             required:
                             - values