diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6996de2..11c5df1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -18,6 +18,9 @@
 * `wn.Form.tags()` ([#65])
 * `wn.Count` ([#65])
 * `wn.Sense.counts()` ([#65])
+* Index entries of different types; default is `'wordnet'`, `'ili'` is
+  also available ([#23])
+* A CILI index entry ([#23])
 
 ### Fixed
 
diff --git a/wn/__main__.py b/wn/__main__.py
index d797802..42c2c6f 100644
--- a/wn/__main__.py
+++ b/wn/__main__.py
@@ -27,8 +27,8 @@ def _projects(args):
                 key,
                 info['id'],
                 info['version'],
-                f"[{info['language']}]",
-                info['label'],
+                f"[{info['language'] or '---'}]",
+                info['label'] or '---',
             ))
         )
 
diff --git a/wn/_config.py b/wn/_config.py
index ae3fcbe..78d33c8 100644
--- a/wn/_config.py
+++ b/wn/_config.py
@@ -10,6 +10,7 @@
 
 from wn import Error
 from wn._types import AnyPath
+from wn.constants import _WORDNET
 from wn._util import is_url, resources, short_hash
 
 # The directory where downloaded and added data will be stored.
@@ -58,11 +59,12 @@ def index(self) -> Dict[str, Dict]:
         return self._projects
 
     def add_project(
-            self,
-            id: str,
-            label: str,
-            language: str,
-            license: str = None,
+        self,
+        id: str,
+        type: str = _WORDNET,
+        label: str = None,
+        language: str = None,
+        license: str = None,
     ) -> None:
         """Add a new wordnet project to the index.
 
@@ -77,6 +79,7 @@ def add_project(
         if id in self._projects:
             raise ValueError(f'project already added: {id}')
         self._projects[id] = {
+            'type': type,
             'label': label,
             'language': language,
             'versions': {},
@@ -137,6 +140,7 @@ def get_project_info(self, arg: str) -> Dict:
         return dict(
             id=id,
             version=version,
+            type=project['type'],
             label=project['label'],
             language=project['language'],
             license=versions[version].get('license', project.get('license')),
@@ -180,8 +184,9 @@ def update(self, data: dict) -> None:
             else:
                 self.add_project(
                     id,
-                    project['label'],
-                    project['language'],
+                    type=project.get('type', _WORDNET),
+                    label=project.get('label'),
+                    language=project.get('language'),
                     license=project.get('license'),
                 )
             for version, info in project.get('versions', {}).items():
diff --git a/wn/constants.py b/wn/constants.py
index ee89deb..6832ebe 100644
--- a/wn/constants.py
+++ b/wn/constants.py
@@ -294,3 +294,8 @@
     'presupposed': 10,
     'proposed': 11,
 }
+
+# resource types
+
+_WORDNET = 'wordnet'
+_ILI = 'ili'
diff --git a/wn/index.toml b/wn/index.toml
index 771ecb2..7c1de0c 100644
--- a/wn/index.toml
+++ b/wn/index.toml
@@ -1,3 +1,10 @@
+[cili]
+  type = "ili"
+  label = "Collaborative Interlingual Index"
+  license = "https://creativecommons.org/licenses/by/4.0/"
+  [cili.versions."1.0"]
+    url = "https://github.com/globalwordnet/cili/releases/download/v1.0/cili.tsv.xz"
+
 [ewn]
   label = "Open English WordNet"
   language = "en"