diff --git a/README.md b/README.md
index 4fcc979..10f994e 100644
--- a/README.md
+++ b/README.md
@@ -287,7 +287,7 @@ const (
 	HeaderCurrentURL            = "HX-Current-URL"
 	HeaderHistoryRestoreRequest = "HX-History-Restore-Request"
 	HeaderPrompt                = "HX-Prompt"
-	HeaderRequest               = "Hx-Request"
+	HeaderRequest               = "HX-Request"
 	HeaderTarget                = "HX-Target"
 	HeaderTriggerName           = "Hx-Trigger-Name"
 )
diff --git a/header.go b/header.go
index 8ff1d64..f67fbca 100644
--- a/header.go
+++ b/header.go
@@ -12,7 +12,7 @@ const (
 	// Request header for the user response to an hx-prompt.
 	HeaderPrompt = "HX-Prompt"
 	// Request header that is always “true” for HTMX requests.
-	HeaderRequest = "Hx-Request"
+	HeaderRequest = "HX-Request"
 	// Request header of the id of the target element if it exists.
 	HeaderTarget = "HX-Target"
 	// Request header of the name of the triggered element if it exists.