diff --git a/python/lsst/cell_coadds/_single_cell_coadd.py b/python/lsst/cell_coadds/_single_cell_coadd.py
index c0ef6532..7f2c6e89 100644
--- a/python/lsst/cell_coadds/_single_cell_coadd.py
+++ b/python/lsst/cell_coadds/_single_cell_coadd.py
@@ -126,6 +126,28 @@ def __init__(
             self._inputs = {}
         self._identifiers = identifiers
         self._aperture_correction_map = aperture_correction_map
+        self.set_cell_edges()
+
+    def set_cell_edges(
+        self,
+        *,
+        edge_width=1,
+        edge_mask_name="CELL_EDGE",
+    ):
+        """Set a mask bit indicating the inner cell edges.
+
+        Parameters
+        ----------
+        edge_width : `int`, optional
+            The width of the edge region to flag, in pixels.
+        edge_mask_name : `str`, optional
+            The name of the mask plane to add for the edge region.
+        """
+        self._inner.mask.addMaskPlane(edge_mask_name)
+        self._inner.mask.array[:, :edge_width] |= self._inner.mask.getPlaneBitMask(edge_mask_name)
+        self._inner.mask.array[:, -edge_width:] |= self._inner.mask.getPlaneBitMask(edge_mask_name)
+        self._inner.mask.array[:edge_width, :] |= self._inner.mask.getPlaneBitMask(edge_mask_name)
+        self._inner.mask.array[-edge_width:, :] |= self._inner.mask.getPlaneBitMask(edge_mask_name)
 
     def _set_cell_edges(
         self,