diff --git a/frame/base/bli_auxinfo.h b/frame/base/bli_auxinfo.h
index 3fbc8dbdb..d51e58225 100644
--- a/frame/base/bli_auxinfo.h
+++ b/frame/base/bli_auxinfo.h
@@ -65,6 +65,11 @@ static inc_t bli_auxinfo_is_b( auxinfo_t* ai )
 	return ai->is_b;
 }
 
+static inc_t bli_auxinfo_dt_on_output( auxinfo_t* ai )
+{
+	return ai->dt_on_output;
+}
+
 
 // auxinfo_t field modification
 
@@ -100,5 +105,10 @@ static void bli_auxinfo_set_is_b( inc_t is, auxinfo_t* ai )
 	ai->is_b = is;
 }
 
+static void bli_auxinfo_set_dt_on_output( num_t dt_on_output, auxinfo_t* ai )
+{
+	ai->dt_on_output = dt_on_output;
+}
+
 #endif 
 
diff --git a/frame/include/bli_type_defs.h b/frame/include/bli_type_defs.h
index 2d400518d..35f317735 100644
--- a/frame/include/bli_type_defs.h
+++ b/frame/include/bli_type_defs.h
@@ -998,6 +998,9 @@ typedef struct
 	inc_t  is_a;
 	inc_t  is_b;
 
+	// The type to convert to on output.
+	num_t  dt_on_output;
+
 } auxinfo_t;