diff --git a/docs/src/main/paradox/typed/guide/tutorial_4.md b/docs/src/main/paradox/typed/guide/tutorial_4.md
index cd23975b78..cf3ee3278e 100644
--- a/docs/src/main/paradox/typed/guide/tutorial_4.md
+++ b/docs/src/main/paradox/typed/guide/tutorial_4.md
@@ -28,7 +28,7 @@ The following guidelines help us choose the most appropriate actor hierarchy:
 
 ## Device manager hierarchy
 
-Considering the principles outlined in the previous section, We will model the device manager component as an actor tree with three levels:
+Considering the principles outlined in the previous section, we will model the device manager component as an actor tree with three levels:
 
 * The top level supervisor actor represents the system component for devices. It is also the entry point to look up and create device group and device actors.
 * At the next level, group actors each supervise the device actors for one group id (e.g. one home). They also provide services, such as querying temperature readings from all of the available devices in their group.