diff --git a/python/lsst/afw/image/_exposureSummaryStats.py b/python/lsst/afw/image/_exposureSummaryStats.py
index dd19ed46c..3539e4001 100644
--- a/python/lsst/afw/image/_exposureSummaryStats.py
+++ b/python/lsst/afw/image/_exposureSummaryStats.py
@@ -127,6 +127,11 @@ class ExposureSummaryStats(Storable):
     grid of unmasked pixels.
     """
 
+    psfApCorrDelta: float = float('nan')
+    """Delta (max - min) of the psf flux aperture correction factors evaluated
+    on a grid of unmasked pixels.
+    """
+
     maxDistToNearestPsf: float = float('nan')
     """Maximum distance of an unmasked pixel to its nearest model psf star
     (pixels).
@@ -348,6 +353,12 @@ def update_schema(cls, schema: Schema) -> None:
             doc="Delta (max - min) of the model psf aperture flux values evaluated on a grid of "
             "unmasked pixels.",
         )
+        schema.addField(
+            "psfApCorrDelta",
+            type="F",
+            doc="Delta (max - min) of the model psf aperture correction factors evaluated on "
+            "a grid of unmasked pixels.",
+        )
         schema.addField(
             "maxDistToNearestPsf",
             type="F",