diff --git a/dtschema/schemas/pci/pci-bus-common.yaml b/dtschema/schemas/pci/pci-bus-common.yaml
index 5257339e..35ac36f8 100644
--- a/dtschema/schemas/pci/pci-bus-common.yaml
+++ b/dtschema/schemas/pci/pci-bus-common.yaml
@@ -173,6 +173,9 @@ properties:
   vpcie12v-supply:
     description: 12v regulator phandle for the slot
 
+  vpcie1v8-supply:
+    description: 1.8v VIO regulator phandle for M.2 slot
+
   vpcie3v3-supply:
     description: 3.3v regulator phandle for the slot