diff --git a/orsopy/fileio/base.py b/orsopy/fileio/base.py
index 8e3db140..6c352d44 100644
--- a/orsopy/fileio/base.py
+++ b/orsopy/fileio/base.py
@@ -724,6 +724,16 @@ def to_sigma(self):
             return 1.0
 
 
+@orsodataclass
+class ContentHash(Header):
+    """
+    A hash of some content, using standard algorithms
+    """
+
+    digest: str
+    algorithm: Literal["sha1", "sha256", "sha384", "sha512", "sha3_256", "sha3_512"]
+
+
 @orsodataclass
 class File(Header):
     """
@@ -739,6 +749,7 @@ class File(Header):
             " itself"
         },
     )
+    hash: Optional[ContentHash] = None
 
     def __post_init__(self):
         """