diff --git a/source4/librpc/idl/drsblobs.idl b/source4/librpc/idl/drsblobs.idl
index 96ef65003ec..216506be5c4 100644
--- a/source4/librpc/idl/drsblobs.idl
+++ b/source4/librpc/idl/drsblobs.idl
@@ -201,6 +201,31 @@ interface drsblobs {
 		[in] ldapControlDirSyncCookie cookie
 		);
 
+	typedef [public] struct {
+		uint16 name_len;
+		uint16 data_len;
+		uint16 id;
+		[charset(UTF16)] uint8 name[name_len];
+		uint8 data[data_len];
+	} supplementalCredentialsPackage;
+
+	typedef [public] struct {
+		uint32 unknown1;
+		[charset(UTF16)] uint16 unknown2[0x30];
+		uint16 unknown3;
+		uint16 num_packages;
+		supplementalCredentialsPackage packages[num_packages];
+	} supplementalCredentialsSubBlob;
+
+	typedef [public] struct {
+		[value(0)] uint32 version;
+		[subcontext(4)] supplementalCredentialsSubBlob sub;
+	} supplementalCredentialsBlob;
+
+	void decode_supplementalCredentials(
+		[in] supplementalCredentialsBlob blob
+		);
+
 	typedef [public] struct {
 		uint32 marker;
 		DATA_BLOB data;