diff --git a/ops/model.py b/ops/model.py
index b6f04e3ef..69370f63e 100644
--- a/ops/model.py
+++ b/ops/model.py
@@ -1700,6 +1700,7 @@ def __getitem__(self, key: str) -> str:
 
     # This is provided by Mapping, but we need to make the return type more explicit.
     def get(self, key: str, default: Optional[str] = None) -> Optional[str]:
+        """Return the vaule for key if key is in the data, else default."""
         try:
             return self.__getitem__(key)
         except KeyError: