diff --git a/doc/nrf/protocols/bt/bt_stack_arch.rst b/doc/nrf/protocols/bt/bt_stack_arch.rst
index a733284c4187..89a5c1c6c603 100644
--- a/doc/nrf/protocols/bt/bt_stack_arch.rst
+++ b/doc/nrf/protocols/bt/bt_stack_arch.rst
@@ -1,5 +1,5 @@
-Blutooth stack architecture
-###########################
+Bluetooth stack architecture
+############################
 
 .. contents::
    :local: