diff --git a/src/rad/resources/schemas/sky_background-1.0.0.yaml b/src/rad/resources/schemas/sky_background-1.0.0.yaml
index c98fd4e0..65241724 100644
--- a/src/rad/resources/schemas/sky_background-1.0.0.yaml
+++ b/src/rad/resources/schemas/sky_background-1.0.0.yaml
@@ -9,9 +9,9 @@ properties:
   level:
     title: Sky Background Level
     description: |
-      The sky background level in DN / s.
+      The sky background level in DN / s or MJy.sr**-1.
     type: number
-    unit: "DN / s"
+    unit: ["DN / s", "MJy.sr**-1"]
   method:
     title: Sky Background Method
     description: |
diff --git a/src/rad/resources/schemas/wfi_image-1.0.0.yaml b/src/rad/resources/schemas/wfi_image-1.0.0.yaml
index 55d0f202..4ffa1a28 100644
--- a/src/rad/resources/schemas/wfi_image-1.0.0.yaml
+++ b/src/rad/resources/schemas/wfi_image-1.0.0.yaml
@@ -38,10 +38,7 @@ properties:
     datatype: float32
     exact_datatype: true
     ndim: 2
-    unit:
-      oneOf:
-        - type: string
-          enum: ["DN / s", "MJy.sr**-1"]
+    unit: ["DN / s", "MJy.sr**-1"]
   dq:
     title: Data Quality Flags
     description: |
@@ -58,10 +55,7 @@ properties:
     datatype: float32
     exact_datatype: true
     ndim: 2
-    unit:
-      oneOf:
-        - type: string
-          enum: ["DN / s", "MJy.sr**-1"]
+    unit: ["DN / s", "MJy.sr**-1"]
   var_poisson:
     title: Poisson Variance (DN^2 / s^2)
     description: |
@@ -70,10 +64,7 @@ properties:
     datatype: float32
     exact_datatype: true
     ndim: 2
-    unit:
-      oneOf:
-        - type: string
-          enum: ["DN2 / s2", "MJy**2.sr**-2"]
+    unit: ["DN2 / s2", "MJy**2.sr**-2"]
   var_rnoise:
     title: Read Noise (DN^2 / s^2)
     description: |
@@ -82,10 +73,7 @@ properties:
     datatype: float32
     exact_datatype: true
     ndim: 2
-    unit:
-      oneOf:
-        - type: string
-          enum: ["DN2 / s2", "MJy**2.sr**-2"]
+    unit: ["DN2 / s2", "MJy**2.sr**-2"]
   var_flat:
     title: Variance for Estimate of Flat Pixel Flux (DN^2 / s^2).
     description: |
@@ -95,10 +83,7 @@ properties:
     datatype: float32
     exact_datatype: true
     ndim: 2
-    unit:
-      oneOf:
-        - type: string
-          enum: ["DN2 / s2", "MJy**2.sr**-2"]
+    unit: ["DN2 / s2", "MJy**2.sr**-2"]
   amp33:
     title: Amp 33 Reference Pixel Data (DN)
     description: |