diff --git a/aeon_ddl.proto b/aeon_ddl.proto
index b2283fb..fd97627 100644
--- a/aeon_ddl.proto
+++ b/aeon_ddl.proto
@@ -12,6 +12,9 @@ service DDLService {
 
   // Drops a space by name.
   rpc DropSpace(DropSpaceRequest) returns (DropSpaceResponse) {}
+
+  // Restart CDC for a space.
+  rpc RestartCDC(RestartCDCRequest) returns (RestartCDCResponse) {}
 }
 
 // Creates a space with the given definition.
@@ -52,3 +55,15 @@ message DropSpaceResponse {
   // Error information. Set only on failure.
   Error error = 1;
 }
+
+// Restart CDC on a space.
+
+message RestartCDCRequest {
+  // Name of the space to restart CDC.
+  string space = 1;
+}
+
+message RestartCDCResponse {
+  // Error information. Set only on failure.
+  Error error = 1;
+}