diff --git a/src/registry_schemas/example_data/schema_data.py b/src/registry_schemas/example_data/schema_data.py
index 6581915..edda6c9 100644
--- a/src/registry_schemas/example_data/schema_data.py
+++ b/src/registry_schemas/example_data/schema_data.py
@@ -1076,8 +1076,8 @@
         'cooperativeAssociationType': 'CP',
         'rulesFileKey': 'cooperative/fa00c6bf-eaad-4a07-a3d2-4786ecd6b83b.jpg',
         'rulesFileName': 'rule_file.jpg',
-        'memorandomFileKey': 'cooperative/f722bf16-86be-430d-928d-5529853a3a2c.pdf',
-        'memorandomFileName': 'memorandom_file.pdf'
+        'memorandumFileKey': 'cooperative/f722bf16-86be-430d-928d-5529853a3a2c.pdf',
+        'memorandumFileName': 'memorandum_file.pdf'
     }
 }
 
diff --git a/src/registry_schemas/schemas/cooperative.json b/src/registry_schemas/schemas/cooperative.json
index e19ab76..28bb52b 100644
--- a/src/registry_schemas/schemas/cooperative.json
+++ b/src/registry_schemas/schemas/cooperative.json
@@ -7,13 +7,18 @@
         "cooperativeAssociationType",
         "rulesFileKey",
         "rulesFileName",
-        "memorandomFileKey",
-        "memorandomFileName"
+        "memorandumFileKey",
+        "memorandumFileName"
     ],
     "properties": {
         "cooperativeAssociationType": {
             "type": "string",
-            "title": "The association type for cooperative filing"
+            "title": "The association type for cooperative filing",
+            "enum": [
+                "CP",
+                "HC",
+                "CSC"
+            ]
         },
         "rulesFileKey": {
             "type": "string",
@@ -23,11 +28,11 @@
             "type": "string",
             "title": "The file name while uploading"
         },
-        "memorandomFileKey": {
+        "memorandumFileKey": {
             "type": "string",
-            "title": "The Identifier for memorandom file in file server"
+            "title": "The Identifier for memorandum file in file server"
         },
-        "memorandomFileName": {
+        "memorandumFileName": {
             "type": "string",
             "title": "The file name while uploading"
         }
diff --git a/src/registry_schemas/utils.py b/src/registry_schemas/utils.py
index b46d949..e2e94d9 100644
--- a/src/registry_schemas/utils.py
+++ b/src/registry_schemas/utils.py
@@ -35,7 +35,7 @@ def _load_json_schema(filename: str):
     relative_path = path.join('schemas', filename)
     absolute_path = path.join(path.dirname(__file__), relative_path)
 
-    with open(absolute_path, 'r') as schema_file:
+    with open(absolute_path, 'r') as schema_file:  # pylint: disable=unspecified-encoding
         schema = json.loads(schema_file.read())
 
         return schema
@@ -54,7 +54,7 @@ def get_schema_store(validate_schema: bool = False, schema_search_path: str = No
         for fname in fnames:
             fpath = path.join(schema_search_path, fname)
             if fpath[-5:] == '.json':
-                with open(fpath, 'r') as schema_fd:
+                with open(fpath, 'r') as schema_fd:  # pylint: disable=unspecified-encoding
                     schema = json.load(schema_fd)
                     if '$id' in schema:
                         schemastore[schema['$id']] = schema
diff --git a/src/registry_schemas/version.py b/src/registry_schemas/version.py
index 405b38b..313a6e4 100644
--- a/src/registry_schemas/version.py
+++ b/src/registry_schemas/version.py
@@ -22,4 +22,4 @@
 Development release segment: .devN
 """
 
-__version__ = '2.15.1'  # pylint: disable=invalid-name
+__version__ = '2.15.2'  # pylint: disable=invalid-name