Include documentation for recursive config include

source/_topics/splitting_configuration.markdown

@@ -196,6 +196,22 @@ We offer four advanced options to include whole directories at once.
 - `!include_dir_merge_list` will return the content of a directory as a list by merging all files (which should contain a list) into 1 big list.
 - `!include_dir_merge_named` will return the content of a directory as a dictionary by loading each file and merging it into 1 big dictionary.
 
+These work recursively. As an example using `!include_dir_* automation`, will include all 6 files shown below:
+
+```bash
+.
+└── .homeassistant
+    ├── automation
+    │   ├── lights
+    │   │   ├── turn_light_off_bedroom.yaml
+    │   │   ├── turn_light_off_lounge.yaml
+    │   │   ├── turn_light_on_bedroom.yaml
+    │   │   └── turn_light_on_lounge.yaml
+    │   ├── say_hello.yaml
+    │   └── sensors
+    │       └── react.yaml
+    └── configuration.yaml (not included)
+```
 
 #### {% linkable_title Example: `!include_dir_list` %}
 
@@ -377,7 +393,6 @@ automation: !include_dir_merge_list automation/
   action:
     service: light.turn_on
     entity_id: light.entryway
-    
 - alias: Automation 2
   trigger:
     platform: state