diff --git a/power_grid_model_c/power_grid_model/include/power_grid_model/calculation_parameters.hpp b/power_grid_model_c/power_grid_model/include/power_grid_model/calculation_parameters.hpp
index 8c92a6cdc..8e70e3f11 100644
--- a/power_grid_model_c/power_grid_model/include/power_grid_model/calculation_parameters.hpp
+++ b/power_grid_model_c/power_grid_model/include/power_grid_model/calculation_parameters.hpp
@@ -110,7 +110,6 @@ template <symmetry_tag sym_type> struct PowerSensorCalcParam {
 
 // current sensor calculation parameters for state estimation
 // The value is the complex current
-//   * for appliances, it is always in injection direction
 //   * for branches, the direction is node -> branch
 template <symmetry_tag sym_type> struct CurrentSensorCalcParam {
     using sym = sym_type;
@@ -119,8 +118,8 @@ template <symmetry_tag sym_type> struct CurrentSensorCalcParam {
 
     AngleMeasurementType angle_measurement_type{};
     ComplexValue<sym> value{};
-    double i_variance{};       // variance (sigma^2) of the error range of the current, in p.u.
-    double i_angle_variance{}; // variance (sigma^2) of the error range of the current angle, in p.u.
+    double i_real_variance{}; // variance (sigma^2) of the error range of real part of the current, in p.u.
+    double i_imag_variance{}; // variance (sigma^2) of the error range of imaginary part of the current, in p.u.
 };
 
 template <typename T>
diff --git a/tests/cpp_unit_tests/test_current_sensor.cpp b/tests/cpp_unit_tests/test_current_sensor.cpp
index a48d0a8cc..d5f0e1920 100644
--- a/tests/cpp_unit_tests/test_current_sensor.cpp
+++ b/tests/cpp_unit_tests/test_current_sensor.cpp
@@ -59,8 +59,8 @@ TEST_CASE("Test current sensor") {
 
             // Check symmetric sensor output for symmetric parameters
             CHECK(sym_sensor_param.angle_measurement_type == AngleMeasurementType::local);
-            CHECK(sym_sensor_param.i_variance == doctest::Approx(0.0));
-            CHECK(sym_sensor_param.i_angle_variance == doctest::Approx(0.0));
+            CHECK(sym_sensor_param.i_real_variance == doctest::Approx(0.0));
+            CHECK(sym_sensor_param.i_imag_variance == doctest::Approx(0.0));
             CHECK(real(sym_sensor_param.value) == doctest::Approx(0.0));
             CHECK(imag(sym_sensor_param.value) == doctest::Approx(0.0));
 
@@ -70,8 +70,8 @@ TEST_CASE("Test current sensor") {
             CHECK(is_nan(sym_sensor_output.i_angle_residual));
 
             // Check symmetric sensor output for asymmetric parameters
-            CHECK(asym_sensor_param.i_variance == doctest::Approx(0.0));
-            CHECK(asym_sensor_param.i_angle_variance == doctest::Approx(0.0));
+            CHECK(asym_sensor_param.i_real_variance == doctest::Approx(0.0));
+            CHECK(asym_sensor_param.i_imag_variance == doctest::Approx(0.0));
             CHECK(real(asym_sensor_param.value[0]) == doctest::Approx(0.0));
             CHECK(imag(asym_sensor_param.value[1]) == doctest::Approx(0.0));