diff --git a/api/apps/installactions.py b/api/apps/installactions.py
index a039858..cf619e0 100644
--- a/api/apps/installactions.py
+++ b/api/apps/installactions.py
@@ -25,5 +25,12 @@ def add_repository_to_installation(self, installation_id, repository_id, **kwarg
         https://developer.github.com/v3/apps/installations/#add-repository-to-installation
         """
         headers = {'Accept': 'application/vnd.github.machine-man-preview+json'}
-        return self.put("/user/installations/{}/repositories/{}".format(installation_id, repository_id), headers = headers, **kwargs)
+        return self.put("/user/installations/{}/repositories/{}".format(installation_id, repository_id),
+                        headers=headers, **kwargs)
 
+    def create_a_content_attavhment(self, content_reference_id, **kwargs):
+        """
+        https://developer.github.com/v3/apps/installations/#create-a-content-attachment
+        """
+        headers = {'Accept': 'application/vnd.github.corsair-preview+json'}
+        return self.post("/content_references/{}/attachments".format(content_reference_id, headers=headers,**kwargs))
diff --git a/api/git/__init__.py b/api/git/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/api/git/tags.py b/api/git/tags.py
new file mode 100644
index 0000000..e7e1885
--- /dev/null
+++ b/api/git/tags.py
@@ -0,0 +1,10 @@
+from core.rest_client import RestClient
+
+
+class Tags(RestClient):
+
+    def create_a_tag_object(self, owner, repo, **kwargs):
+        """
+        https://developer.github.com/v3/git/tags/#create-a-tag-object
+        """
+        return self.post("/repos/{}/{}/git/tags".format(owner, repo), **kwargs)
diff --git a/api/reactions/reactions.py b/api/reactions/reactions.py
index d18402c..33e6bc4 100644
--- a/api/reactions/reactions.py
+++ b/api/reactions/reactions.py
@@ -7,4 +7,5 @@ def list_reactions_for_a_commit_comment(self, owner, repo, comment_id, **kwargs)
         """
         https://developer.github.com/v3/reactions/#list-reactions-for-a-commit-comment
         """
-        return self.get("/repos/{}/{}/comments/{}/reactions".format(owner, repo, comment_id), **kwargs)
+        headers = {'Accept': "application/vnd.github.squirrel-girl-preview+json"}
+        return self.get("/repos/{}/{}/comments/{}/reactions".format(owner, repo, comment_id), headers=headers, **kwargs)