diff --git a/src/fmu/dataio/export/_decorators.py b/src/fmu/dataio/export/_decorators.py
new file mode 100644
index 000000000..0cb2082aa
--- /dev/null
+++ b/src/fmu/dataio/export/_decorators.py
@@ -0,0 +1,17 @@
+import warnings
+from functools import wraps
+
+
+def experimental(func):  # type: ignore
+    """Decorator to mark functions as experimental."""
+
+    @wraps(func)
+    def wrapper(*args, **kwargs):  # type: ignore
+        warnings.warn(
+            f"{func.__name__} is experimental and may change in future versions.",
+            UserWarning,
+            stacklevel=2,
+        )
+        return func(*args, **kwargs)
+
+    return wrapper
diff --git a/src/fmu/dataio/export/rms/volumetrics.py b/src/fmu/dataio/export/rms/volumetrics.py
index 22e5ca81f..100aed45f 100644
--- a/src/fmu/dataio/export/rms/volumetrics.py
+++ b/src/fmu/dataio/export/rms/volumetrics.py
@@ -13,6 +13,7 @@
 from fmu.config.utilities import yaml_load
 from fmu.dataio._logging import null_logger
 
+from .._decorators import experimental
 from ._conditional_rms_imports import import_rms_package
 
 _modules = import_rms_package()
@@ -192,6 +193,7 @@ def export(self) -> dict[str, str]:
         return self._export_volume_table()
 
 
+@experimental
 def export_volumetrics(
     project: Any,
     grid_name: str,
@@ -229,6 +231,9 @@ def export_volumetrics(
         classification: Optional. Use 'internal' or 'restricted' (default).
         workflow: Optional. Information about the work flow; defaulted to
             'rms volumetrics'.
+
+    Note:
+        This function is experimental and may change in future versions.
     """
 
     return _ExportVolumetricsRMS(