diff --git a/documentation/layered-portraits.md b/documentation/layered-portraits.md
index b36ca37..28dc6c5 100644
--- a/documentation/layered-portraits.md
+++ b/documentation/layered-portraits.md
@@ -80,7 +80,11 @@ join Agustina center [extra_data="set Mouth/Happy"]
 update Agustina [extra_data="set Eyes/Wink, set Mouth/Laugh, set Clothes/Outfit2"]
 ```
 
-In the visual editor you can use the same commands in the "Extra Data" field.
+In the visual editor you can use the same commands in the "Extra Data" field:
+
+![](media/layered_portrait/character_join_extra_data.jpg)
+
+You can also control these layers using [Text Effects](./text-effects.md#extra-data-effect).
 
 ## 5.1. Layer Command Syntax
 
diff --git a/documentation/media/layered_portrait/character_join_extra_data.jpg b/documentation/media/layered_portrait/character_join_extra_data.jpg
new file mode 100644
index 0000000..82fb12f
Binary files /dev/null and b/documentation/media/layered_portrait/character_join_extra_data.jpg differ
diff --git a/documentation/text-effects.md b/documentation/text-effects.md
index 10685ab..b319d64 100644
--- a/documentation/text-effects.md
+++ b/documentation/text-effects.md
@@ -106,6 +106,12 @@ Changes the portrait of the speaker to the portrait with the given name.
 
 Changes the typing mood to the one with the given name.
 
+### Extra Data Effect
+
+**Syntax:** `[extra_data=value]`
+
+Changes the extra data of the speaker to the given value.
+
 ---
 
 ## Auto-Advance Effect