diff --git a/CHANGELOG.md b/CHANGELOG.md
index c5e61284..2c792db3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -32,6 +32,7 @@ Keep it human-readable, your future self will thank you!
 - GraphTransformerMapperBlock chunking to reduce memory usage during inference [#46](https://github.com/ecmwf/anemoi-models/pull/46)
 - New `NamedNodesAttributes` class to handle node attributes in a more flexible way [#64](https://github.com/ecmwf/anemoi-models/pull/64)
 - Contributors file [#69](https://github.com/ecmwf/anemoi-models/pull/69)
+- Added `supporting_arrays` argument, which contains arrays to store in checkpoints. [#97](https://github.com/ecmwf/anemoi-models/pull/97)
 
 ### Changed
 - Bugfixes for CI
diff --git a/src/anemoi/models/interface/__init__.py b/src/anemoi/models/interface/__init__.py
index 25b7852a..261dec29 100644
--- a/src/anemoi/models/interface/__init__.py
+++ b/src/anemoi/models/interface/__init__.py
@@ -37,6 +37,8 @@ class AnemoiModelInterface(torch.nn.Module):
         Statistics for the data.
     metadata : dict
         Metadata for the model.
+    supporting_arrays : dict
+        Numpy arraysto store in the checkpoint.
     data_indices : dict
         Indices for the data.
     pre_processors : Processors
@@ -48,7 +50,14 @@ class AnemoiModelInterface(torch.nn.Module):
     """
 
     def __init__(
-        self, *, config: DotDict, graph_data: HeteroData, statistics: dict, data_indices: dict, metadata: dict
+        self,
+        *,
+        config: DotDict,
+        graph_data: HeteroData,
+        statistics: dict,
+        data_indices: dict,
+        metadata: dict,
+        supporting_arrays: dict = None,
     ) -> None:
         super().__init__()
         self.config = config
@@ -57,6 +66,7 @@ def __init__(
         self.graph_data = graph_data
         self.statistics = statistics
         self.metadata = metadata
+        self.supporting_arrays = supporting_arrays if supporting_arrays is not None else {}
         self.data_indices = data_indices
         self._build_model()