diff --git a/docs/extending/application-features.md b/docs/extending/application-features.md
index 5f05173eb1..19ef2598f1 100644
--- a/docs/extending/application-features.md
+++ b/docs/extending/application-features.md
@@ -33,7 +33,7 @@ All the customizations are stored in the `features` section of the configuration
     "viewer": {
       "toolbarActions:": [],
       "openWith": [],
-      "content": []
+      "extensions": []
     },
     "sidebar": [],
     "content-metadata-presets": []
@@ -397,7 +397,7 @@ declared in the `rules` section:
 
 Viewer component in ACA supports the following extension points:
 
-- Content Viewers
+- Viewer extensions
 - Toolbar actions
 - `More` toolbar actions
 - `Open With` actions
@@ -419,9 +419,9 @@ Viewer component in ACA supports the following extension points:
 }
 ```
 
-### Content View
+### Viewer extensions
 
-You can provide custom components that render a particular type of the content based on extensions.
+You can provide custom components that render a particular type of the content based on file extensions.
 
 ```json
 {
@@ -431,7 +431,7 @@ You can provide custom components that render a particular type of the content b
 
   "features": {
     "viewer": {
-      "content": [
+      "extensions": [
         {
           "id": "app.viewer.pdf",
           "fileExtension": "pdf",
diff --git a/docs/ja/extending/application-features.md b/docs/ja/extending/application-features.md
index 9c3a3b4e48..704bf1d204 100644
--- a/docs/ja/extending/application-features.md
+++ b/docs/ja/extending/application-features.md
@@ -33,7 +33,7 @@ ACA は、次の拡張ポイントのセットをサポートします:
     "viewer": {
       "toolbarActions:": [],
       "openWith": [],
-      "content": []
+      "extensions": []
     },
     "sidebar": [],
     "content-metadata-presets": []
@@ -376,7 +376,7 @@ ACA の Viewer コンポーネントは、次の拡張ポイントをサポー
 
   "features": {
     "viewer": {
-      "content": [],
+      "extensions": [],
       "toolbarActions:": [],
       "openWith": []
     }
@@ -396,7 +396,7 @@ ACA の Viewer コンポーネントは、次の拡張ポイントをサポー
 
   "features": {
     "viewer": {
-      "content": [
+      "extensions": [
         {
           "id": "app.viewer.pdf",
           "fileExtension": "pdf",
diff --git a/docs/tutorials/custom-viewer.md b/docs/tutorials/custom-viewer.md
index f2296c86ae..41c3834993 100644
--- a/docs/tutorials/custom-viewer.md
+++ b/docs/tutorials/custom-viewer.md
@@ -72,7 +72,7 @@ You also need to provide in your `app.extension.json` its details:
   "$description": "my viewer  plugin",
   "features": {
     "viewer": {
-      "content": [
+      "extensions": [
         {
           "id": "my.custom.viewer",
           "fileExtension": ["png", "jpg"],
@@ -93,7 +93,7 @@ You can also use the `*` wildcard symbol to make your custom viewer implementati
   "$description": "my viewer  plugin",
   "features": {
     "viewer": {
-      "content": [
+      "extensions": [
         {
           "id": "my.custom.viewer",
           "fileExtension": "*",
diff --git a/extension.schema.json b/extension.schema.json
index df831c3428..69f668bf7e 100644
--- a/extension.schema.json
+++ b/extension.schema.json
@@ -807,7 +807,7 @@
               "items": { "$ref": "#/definitions/contentActionRef" },
               "minItems": 1
             },
-            "content": {
+            "extensions": {
               "description": "Viewer content extensions",
               "type": "array",
               "items": { "$ref": "#/definitions/viewerExtensionRef" },
diff --git a/projects/aca-content/assets/app.extensions.json b/projects/aca-content/assets/app.extensions.json
index 4e6cfd14ee..5510dfbd11 100644
--- a/projects/aca-content/assets/app.extensions.json
+++ b/projects/aca-content/assets/app.extensions.json
@@ -1204,7 +1204,7 @@
           }
         ]
       },
-      "content": [
+      "extensions": [
         {
           "id": "app.viewer.pdf",
           "disabled": true,