diff --git a/acquisitions.py b/acquisitions.py
index 4d3280995b50dcb42de27f478cbfd6e65252fc3b..afb52b7a98d71fb9dcbe69b7a3e33ad5be6f9164 100644
--- a/acquisitions.py
+++ b/acquisitions.py
@@ -24,6 +24,10 @@ ACQUISITION_PUT_SCHEMA = {
             'title': 'Notes',
             'type': 'string',
         },
+        'description': {
+            'title': 'Description',
+            'type': 'string'
+        },
         'files': {
             'title': 'Files',
             'type': 'array',
diff --git a/sessions.py b/sessions.py
index e00ea771c16cfd13e18d44d8cfd689f137f544d7..e95cde4f78b8b984b03faecaff09a509cf30160e 100644
--- a/sessions.py
+++ b/sessions.py
@@ -27,6 +27,16 @@ SESSION_PUT_SCHEMA = {
             'type': 'string',
             'pattern': '^[0-9a-f]{24}$',
         },
+        'subject': {
+            'title': 'Subject',
+            'type': 'object',
+            'properties': {
+                'code': {
+                    'title': 'Code',
+                    'type': 'string'
+                }
+            }
+        },
         'files': {
             'title': 'Files',
             'type': 'array',