diff --git a/csst_common/status.py b/csst_common/status.py
index 3bb4cde7469def3244d82a14a238197d5d62d500..170807cf95f5a13ace61b0d9eb60ac0ca0040324 100644
--- a/csst_common/status.py
+++ b/csst_common/status.py
@@ -49,10 +49,14 @@ class CsstResult:
     ):
         if files is None:
             files = []
-        assert isinstance(status, CsstStatus)
-        assert isinstance(files, list)
+        assert isinstance(
+            status, CsstStatus
+        ), "`status` should be a `csst_common.CsstStatus` type objects."
+        assert isinstance(
+            files, list
+        ), "`files` should be a list of `str` type objects."
         for _ in files:
-            assert isinstance(_, str)
+            assert isinstance(_, str), "`files` should be a list of `str` type objects."
         self.status: CsstStatus = status
         self.files: Optional[list] = files
         self.output: dict = output