diff --git a/plugins/proto/RemoteFortressReader.proto b/plugins/proto/RemoteFortressReader.proto
index 4e6f5ba3e..c0ed000c7 100644
--- a/plugins/proto/RemoteFortressReader.proto
+++ b/plugins/proto/RemoteFortressReader.proto
@@ -749,4 +749,9 @@ message DigCommand
 {
     optional TileDigDesignation designation = 1;
     repeated Coord locations = 2;
+}
+
+message SingleBool
+{
+    optional bool Value = 1;
 }
\ No newline at end of file