diff --git a/JsonSchemas/Credentials.json b/JsonSchemas/Credentials.json
index 86aaa8bb4..3e2b7b8ae 100644
--- a/JsonSchemas/Credentials.json
+++ b/JsonSchemas/Credentials.json
@@ -22,7 +22,8 @@
                 "StoreWithDistinguishedName",
                 "SignedAssertionFromManagedIdentity",
                 "SignedAssertionFilePath",
-                "SignedAssertionFromVault"
+                "SignedAssertionFromVault",
+                "CustomSignedAssertion"
             ],
             "description": "Enumeration of credential sources."
         },
@@ -266,6 +267,32 @@
                             "KeyVaultCertificateName"
                         ]
                     }
+                },
+                {
+                    "if": {
+                        "properties": {
+                            "SourceType": {
+                                "const": "CustomSignedAssertion"
+                            }
+                        }
+                    },
+                    "then": {
+                        "properties": {
+                            "CustomSignedAssertionProviderName": {
+                                "type": "string"
+                            },
+                            "CustomSignedAssertionProviderData": {
+                                "type": [
+                                    "object",
+                                    "null"
+                                ]
+                            }
+                        },
+                        "required": [
+                            "SourceType",
+                            "CustomSignedAssertionProviderName"
+                        ]
+                    }
                 }
             ]
         },