diff --git a/docs/topics/api/discovery.rst b/docs/topics/api/discovery.rst
index fd56a111d7..5c82256c96 100644
--- a/docs/topics/api/discovery.rst
+++ b/docs/topics/api/discovery.rst
@@ -26,7 +26,7 @@ Firefox (about:addons).
     :>json string results[].heading: The heading for this item. May contain some HTML tags.
     :>json string|null results[].description: The description for this item, if any. May contain some HTML tags.
     :>json boolean results[].is_recommendation: If this item was from the recommendation service, rather than static curated content.
-    :>json object results[].addon: The :ref:`add-on <addon-detail-object>` for this item. Only a subset of fields are present: ``id``, ``current_version`` (with only the ``compatibility`` and ``files`` fields present), ``guid``, ``icon_url``, ``name``, ``previews``, ``slug``, ``theme_data``, ``type`` and ``url``.
+    :>json object results[].addon: The :ref:`add-on <addon-detail-object>` for this item. Only a subset of fields are present: ``id``, ``current_version`` (with only the ``compatibility``, ``is_strict_compatibility_enabled`` and ``files`` fields present), ``guid``, ``icon_url``, ``name``, ``previews``, ``slug``, ``theme_data``, ``type`` and ``url``.
 
 
 -------------------------
diff --git a/docs/topics/api/overview.rst b/docs/topics/api/overview.rst
index 19ccb415ab..a81106b573 100644
--- a/docs/topics/api/overview.rst
+++ b/docs/topics/api/overview.rst
@@ -278,3 +278,4 @@ v4 API changelog
 * 2018-09-27: backed out "localised field values are always returned as objects" change from 2018-07-19 from `v4` API.  This is intended to be temporary change while addons-frontend upgrades.
   On addons-dev and addons stage enviroments the previous behavior is available as `api/v4dev`. The `v4dev` api is not available on AMO production server.
   https://github.com/mozilla/addons-server/issues/9467
+* 2018-10-04: added ``is_strict_compatibility_enabled`` to discovery API ``addons.current_version`` object. This change was also backported to the `v3` API. https://github.com/mozilla/addons-server/issues/9520
diff --git a/src/olympia/discovery/serializers.py b/src/olympia/discovery/serializers.py
index 60f659ef69..f9cfff4081 100644
--- a/src/olympia/discovery/serializers.py
+++ b/src/olympia/discovery/serializers.py
@@ -20,7 +20,7 @@ class DiscoveryEditorialContentSerializer(serializers.ModelSerializer):
 
 class DiscoveryVersionSerializer(VersionSerializer):
     class Meta:
-        fields = ('compatibility', 'files',)
+        fields = ('compatibility', 'is_strict_compatibility_enabled', 'files',)
         model = Version
 
 
diff --git a/src/olympia/discovery/tests/test_views.py b/src/olympia/discovery/tests/test_views.py
index 5983d41ae3..54fa34de28 100644
--- a/src/olympia/discovery/tests/test_views.py
+++ b/src/olympia/discovery/tests/test_views.py
@@ -12,6 +12,35 @@ from olympia.discovery.utils import replace_extensions
 
 
 class DiscoveryTestMixin(object):
+    def _check_disco_addon_version(self, data, version):
+        assert data['compatibility']
+        assert len(data['compatibility']) == len(version.compatible_apps)
+        for app, compat in version.compatible_apps.items():
+            assert data['compatibility'][app.short] == {
+                'min': compat.min.version,
+                'max': compat.max.version
+            }
+        assert data['is_strict_compatibility_enabled'] is False
+        assert data['files']
+        assert len(data['files']) == 1
+
+        result_file = data['files'][0]
+        file_ = version.files.latest('pk')
+        assert result_file['id'] == file_.pk
+        assert result_file['created'] == (
+            file_.created.replace(microsecond=0).isoformat() + 'Z')
+        assert result_file['hash'] == file_.hash
+        assert result_file['is_restart_required'] == file_.is_restart_required
+        assert result_file['is_webextension'] == file_.is_webextension
+        assert (
+            result_file['is_mozilla_signed_extension'] ==
+            file_.is_mozilla_signed_extension)
+
+        assert result_file['size'] == file_.size
+        assert result_file['status'] == amo.STATUS_CHOICES_API[file_.status]
+        assert result_file['url'] == file_.get_url_path(src='')
+        assert result_file['permissions'] == file_.webext_permissions_list
+
     def _check_disco_addon(self, result, item, flat_name=False):
         addon = item.addon
         assert result['addon']['id'] == item.addon_id == addon.pk
@@ -28,6 +57,9 @@ class DiscoveryTestMixin(object):
         assert result['heading'] == item.heading
         assert result['description'] == item.description
 
+        self._check_disco_addon_version(
+            result['addon']['current_version'], addon.current_version)
+
     def _check_disco_theme(self, result, item, flat_name=False):
         addon = item.addon
         assert result['addon']['id'] == item.addon_id == addon.pk