diff --git a/schemas/pid.json b/schemas/pid.json
index 06c31fa..4bff66b 100644
--- a/schemas/pid.json
+++ b/schemas/pid.json
@@ -7,6 +7,9 @@
                 "Class": {
                     "type": "string"
                 },
+                "DCoefficient": {
+                    "type": "number"
+                },
                 "FFGainCoefficient": {
                     "type": "number"
                 },