diff --git a/apps/opencs/model/doc/operation.cpp b/apps/opencs/model/doc/operation.cpp
index 8f7472c5f..83a374eb2 100644
--- a/apps/opencs/model/doc/operation.cpp
+++ b/apps/opencs/model/doc/operation.cpp
@@ -23,7 +23,7 @@ void CSMDoc::Operation::prepareStages()
     }
 }
 
-CSMDoc::Operation::Operation (int type) : mType (type) {}
+CSMDoc::Operation::Operation (int type, bool ordered) : mType (type), mOrdered (ordered) {}
 
 CSMDoc::Operation::~Operation()
 {
diff --git a/apps/opencs/model/doc/operation.hpp b/apps/opencs/model/doc/operation.hpp
index 703098852..c7d9a038e 100644
--- a/apps/opencs/model/doc/operation.hpp
+++ b/apps/opencs/model/doc/operation.hpp
@@ -19,12 +19,14 @@ namespace CSMDoc
             int mCurrentStep;
             int mCurrentStepTotal;
             int mTotalSteps;
+            int mOrdered;
 
             void prepareStages();
 
         public:
 
-            Operation (int type);
+            Operation (int type, bool ordered);
+            ///< \param parallel Stages must be executed in the given order.
 
             virtual ~Operation();
 
diff --git a/apps/opencs/model/tools/verifier.cpp b/apps/opencs/model/tools/verifier.cpp
index 9c00d4ea7..d5f2071c4 100644
--- a/apps/opencs/model/tools/verifier.cpp
+++ b/apps/opencs/model/tools/verifier.cpp
@@ -3,5 +3,5 @@
 
 #include "../doc/state.hpp"
 
-CSMTools::Verifier::Verifier() : Operation (CSMDoc::State_Verifying)
+CSMTools::Verifier::Verifier() : Operation (CSMDoc::State_Verifying, false)
 {}