diff --git a/ops/model.py b/ops/model.py
index 3275b4563..d87b022dd 100644
--- a/ops/model.py
+++ b/ops/model.py
@@ -274,7 +274,8 @@ def get_secret(self, *, id: Optional[str] = None, label: Optional[str] = None) -
             label: Secret label if fetching by label (or updating it).
 
         Raises:
-            SecretNotFoundError: If a secret with this ID or label doesn't exist.
+            SecretNotFoundError: If a secret with this ID or label doesn't exist,
+                or the caller does not have permission to view it.
         """
         if not (id or label):
             raise TypeError('Must provide an id or label, or both')