diff --git a/src/guitastro/filenames.py b/src/guitastro/filenames.py
index e401a9a..e0f20db 100644
--- a/src/guitastro/filenames.py
+++ b/src/guitastro/filenames.py
@@ -1221,6 +1221,17 @@ class FileNames(FileNamesException, GuitastroTools):
             param['indexes'] = ""
         return param
 
+    def naming_keys(self) -> list:
+        """Return the keys of a file context
+
+        Returns:
+            Key names.
+
+        """
+        wildcard = self.naming_wildcard()
+        param = self.naming_get(wildcard)
+        return list(param.keys())
+
     def naming_wildcard(self, *args: str, **kwargs: int) -> str:
         """Return the wildcard corresponding to the naming rule
 
--
libgit2 0.21.2