diff --git a/ortools/sat/csharp/Constraints.cs b/ortools/sat/csharp/Constraints.cs
index eccadbeb5b..91df404381 100644
--- a/ortools/sat/csharp/Constraints.cs
+++ b/ortools/sat/csharp/Constraints.cs
@@ -161,7 +161,7 @@ public TableConstraint(CpModelProto model) : base(model)
      *
      * <param name="tuple"> the tuple to add to the constraint</param>
      * <exception cref="ArgumentException"> if the tuple does not have the same length as the array of
-     *     variables of the constraint</exception>
+     *     expressions of the constraint</exception>
      */
     public TableConstraint AddTuple(IEnumerable<int> tuple)
     {
@@ -173,9 +173,9 @@ public TableConstraint AddTuple(IEnumerable<int> tuple)
             table.Values.Add(value);
             count++;
         }
-        if (count != table.Vars.Count)
+        if (count != table.Exprs.Count)
         {
-            throw new ArgumentException("addTuple", "tuple does not have the same length as the variables");
+            throw new ArgumentException("addTuple", "tuple does not have the same length as the expressions");
         }
         return this;
     }
@@ -187,7 +187,7 @@ public TableConstraint AddTuple(IEnumerable<int> tuple)
      *
      * <param name="tuple"> the tuple to add to the constraint</param>
      * <exception cref="ArgumentException"> if the tuple does not have the same length as the array of
-     *     variables of the constraint</exception>
+     *     expressions of the constraint</exception>
      */
     public TableConstraint AddTuple(IEnumerable<long> tuple)
     {
@@ -199,9 +199,9 @@ public TableConstraint AddTuple(IEnumerable<long> tuple)
             table.Values.Add(value);
             count++;
         }
-        if (count != table.Vars.Count)
+        if (count != table.Exprs.Count)
         {
-            throw new ArgumentException("addTuple", "tuple does not have the same length as the variables");
+            throw new ArgumentException("addTuple", "tuple does not have the same length as the expressions");
         }
         return this;
     }
@@ -213,15 +213,15 @@ public TableConstraint AddTuple(IEnumerable<long> tuple)
      *
      * <param name="tuples"> the set of tuple to add to the constraint</param>
      * <exception cref="ArgumentException"> if the tuple does not have the same length as the array of
-     *     variables of the constraint</exception>
+     *     expressions of the constraint</exception>
      */
     public TableConstraint AddTuples(int[,] tuples)
     {
         TableConstraintProto table = Proto.Table;
 
-        if (tuples.GetLength(1) != table.Vars.Count)
+        if (tuples.GetLength(1) != table.Exprs.Count)
         {
-            throw new ArgumentException("addTuples", "tuples does not have the same length as the variables");
+            throw new ArgumentException("addTuples", "tuples does not have the same length as the expressions");
         }
 
         for (int i = 0; i < tuples.GetLength(0); ++i)
@@ -241,15 +241,15 @@ public TableConstraint AddTuples(int[,] tuples)
      *
      * <param name="tuples"> the set of tuple to add to the constraint</param>
      * <exception cref="ArgumentException"> if the tuple does not have the same length as the array of
-     *     variables of the constraint</exception>
+     *     expressions of the constraint</exception>
      */
     public TableConstraint AddTuples(long[,] tuples)
     {
         TableConstraintProto table = Proto.Table;
 
-        if (tuples.GetLength(1) != table.Vars.Count)
+        if (tuples.GetLength(1) != table.Exprs.Count)
         {
-            throw new ArgumentException("addTuples", "tuples does not have the same length as the variables");
+            throw new ArgumentException("addTuples", "tuples does not have the same length as the expressions");
         }
 
         for (int i = 0; i < tuples.GetLength(0); ++i)