diff --git a/requirements.txt b/requirements.txt
index 8c06a49..1278d1f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,9 @@
 Django==1.8
+django-extensions==1.5.5
 django-localflavor==1.1
 djangorestframework==3.1.1
 Markdown==2.6.2
+MySQL-python==1.2.5
 Pillow==2.8.1
+pygraphviz==1.2
+six==1.9.0
diff --git a/src/citasalud/settings/__init__.py b/src/citasalud/settings/__init__.py
index 97426ac..fdb0dea 100644
--- a/src/citasalud/settings/__init__.py
+++ b/src/citasalud/settings/__init__.py
@@ -41,6 +41,7 @@
     'rest_framework',
     'rest_framework.authtoken',
     'citasalud.apps.main',
+    'django_extensions',
 )
 
 MIDDLEWARE_CLASSES = (
diff --git a/src/model.png b/src/model.png
new file mode 100644
index 0000000..d0f8e65
Binary files /dev/null and b/src/model.png differ