diff --git a/include/epanet2.bas b/include/epanet2.bas
index 789a441..0826a3b 100644
--- a/include/epanet2.bas
+++ b/include/epanet2.bas
@@ -128,6 +128,8 @@ Public Const EN_ACCURACY = 1
 Public Const EN_TOLERANCE = 2
 Public Const EN_EMITEXPON = 3
 Public Const EN_DEMANDMULT = 4
+Public Const EN_HEADERROR = 5
+Public Const EN_FLOWCHANGE = 6
 
 Public Const EN_LOWLEVEL = 0     ' Control types
 Public Const EN_HILEVEL = 1
diff --git a/include/epanet2.vb b/include/epanet2.vb
index 44a47a1..fcb71af 100644
--- a/include/epanet2.vb
+++ b/include/epanet2.vb
@@ -121,6 +121,8 @@ Public Const EN_ACCURACY = 1
 Public Const EN_TOLERANCE = 2
 Public Const EN_EMITEXPON = 3
 Public Const EN_DEMANDMULT = 4
+Public Const EN_HEADERROR = 5
+Public Const EN_FLOWCHANGE = 6
 
 Public Const EN_LOWLEVEL = 0     ' Control types
 Public Const EN_HILEVEL = 1