diff --git a/emannotationschemas/__init__.py b/emannotationschemas/__init__.py
index 65186cb..c7bb98c 100644
--- a/emannotationschemas/__init__.py
+++ b/emannotationschemas/__init__.py
@@ -7,7 +7,11 @@
 from emannotationschemas.schemas.synapse import NoCleftSynapse
 from emannotationschemas.schemas.bouton_shape import BoutonShape
 from emannotationschemas.schemas.presynaptic_bouton_type import PresynapticBoutonType
-from emannotationschemas.schemas.base import ReferenceAnnotation, ReferenceTagAnnotation
+from emannotationschemas.schemas.base import (
+    ReferenceAnnotation,
+    ReferenceTagAnnotation,
+    ReferenceInteger,
+)
 from emannotationschemas.schemas.functional_coregistration import (
     FunctionalCoregistration,
     FunctionalUnitCoregistration,
@@ -106,6 +110,7 @@
     "bound_tag_bool": BoundBoolAnnotation,
     "bound_tag_bool_valid": BoundBoolWithValid,
     "bound_tag_valid": BoundTagWithValid,
+    "reference_integer": ReferenceInteger,
 }
 
 
diff --git a/emannotationschemas/schemas/base.py b/emannotationschemas/schemas/base.py
index dae92c1..6487ebb 100644
--- a/emannotationschemas/schemas/base.py
+++ b/emannotationschemas/schemas/base.py
@@ -134,9 +134,9 @@ class SpatialPoint(mm.Schema):
     @mm.post_load
     def transform_position(self, data, **kwargs):
         if self.context.get("postgis", False):
-            data[
-                "position"
-            ] = f'POINTZ({data["position"][0]} {data["position"][1]} {data["position"][2]})'
+            data["position"] = (
+                f'POINTZ({data["position"][0]} {data["position"][1]} {data["position"][2]})'
+            )
 
         return data
 
@@ -190,3 +190,12 @@ class RepresentativePoint(AnnotationSchema):
         required=True,
         description="the point to be used for attaching objects to the dynamic segmentation",
     )
+
+
+class ReferenceInteger(ReferenceAnnotation):
+    """Reference annotation with an integer value"""
+
+    value = mm.fields.Int(
+        required=True,
+        description="Integer value to be attached to the annotation",
+    )