diff --git a/src/siphon/catalog.py b/src/siphon/catalog.py
index 18d8c9a95..4e4409607 100644
--- a/src/siphon/catalog.py
+++ b/src/siphon/catalog.py
@@ -401,6 +401,11 @@ def walk(self, depth=1):
         depth : int
           Maximum recursive depth. Setting 0 will return only datasets within the top-level catalog. If None,
           depth is set to 1000.
+
+        Yields
+        ------
+        Dataset
+            Siphon catalog dataset.
         """
         yield from self.datasets.values()
         if depth is None: