diff --git a/Configuration/RTE/Default.yaml b/Configuration/RTE/Default.yaml
index 905160c..31d2bc5 100644
--- a/Configuration/RTE/Default.yaml
+++ b/Configuration/RTE/Default.yaml
@@ -3,6 +3,7 @@ imports:
     - { resource: 'EXT:rte_ckeditor/Configuration/RTE/Editor/Base.yaml' }
     - { resource: 'EXT:rte_ckeditor/Configuration/RTE/Editor/Plugins.yaml' }
     - { resource: 'EXT:rmnd_headless/Configuration/RTE/Editor/Alignment.yaml' }
+    - { resource: 'EXT:rmnd_headless/Configuration/RTE/Editor/FontSize.yaml' }
     - { resource: 'EXT:rmnd_headless/Configuration/RTE/Editor/Heading.yaml' }
     - { resource: 'EXT:rmnd_headless/Configuration/RTE/Editor/Table.yaml' }
 
@@ -12,6 +13,7 @@ editor:
       items:
         - heading
         - '|'
+        - fontSize
         - bold
         - italic
         - subscript
diff --git a/Configuration/RTE/Editor/FontSize.yaml b/Configuration/RTE/Editor/FontSize.yaml
new file mode 100644
index 0000000..b64c943
--- /dev/null
+++ b/Configuration/RTE/Editor/FontSize.yaml
@@ -0,0 +1,11 @@
+editor:
+  config:
+    fontSize:
+      options:
+        - "default"
+        - "tiny"
+        - "small"
+        - "big"
+        - "huge"
+    importModules:
+      - { "module": "@ckeditor/ckeditor5-font", "exports": ["Font"] }