diff --git a/include/utl/com/_1wire.h b/include/utl/com/_1wire.h
index 877a5e4..7dad5f9 100644
--- a/include/utl/com/_1wire.h
+++ b/include/utl/com/_1wire.h
@@ -646,7 +646,7 @@ namespace _1wire_i_det {
     * \name 1-wire type interface concept
     */
    template <typename T>
-   concept bool _1wire_c = requires (T t, typename T::Speed s, _1wire_id_t id) {
+   concept bool _1Wire_i = requires (T t, typename T::Speed s, _1wire_id_t id) {
       // Object type
       requires not_<std::is_copy_constructible<T>::value>::value;
       requires not_<std::is_copy_assignable<T>::value>::value;
@@ -710,7 +710,7 @@ namespace _1wire_i_det {
     * \return  True if _Tp is a 1-wire interface
     */
    template <typename _Tp>
-   constexpr bool _1wire_c = _1wire_i_det::is_1wire_<_Tp>::value;
+   constexpr bool _1Wire_i = _1wire_i_det::is_1wire_<_Tp>::value;
 #endif
 
 //!@}
diff --git a/include/utl/com/i2c.h b/include/utl/com/i2c.h
index 8cdea23..f04af8a 100644
--- a/include/utl/com/i2c.h
+++ b/include/utl/com/i2c.h
@@ -227,7 +227,7 @@ namespace utl {
     * i2c interface concept
     */
    template <typename T>
-   concept bool i2c_c = requires (T t, const T ct, typename T::Sequence s) {
+   concept bool I2c_i = requires (T t, const T ct, typename T::Sequence s) {
       // Object type
       requires not_<std::is_copy_constructible<T>::value>::value;
       requires not_<std::is_copy_assignable<T>::value>::value;
@@ -276,7 +276,7 @@ namespace utl {
     * \return  True if _Tp is a i2c interface
     */
    template <typename _Tp>
-   constexpr bool i2c_c = i2c_i_details::is_i2c_<_Tp>::value;
+   constexpr bool I2c_i = i2c_i_details::is_i2c_<_Tp>::value;
 #endif
 
 //!@}
diff --git a/include/utl/com/spi.h b/include/utl/com/spi.h
index 7ce0d19..6b9c2e9 100644
--- a/include/utl/com/spi.h
+++ b/include/utl/com/spi.h
@@ -275,12 +275,13 @@ namespace utl {
 
 
 
+/*!
+ * i2c interface concept
+ */
+//! @{
 #if defined _utl_have_concepts
-   /*!
-    * i2c interface concept
-    */
    template <typename T>
-   concept bool spi_c = requires (T t, const T ct, typename T::Sequence s) {
+   concept bool Spi_i = requires (T t, const T ct, typename T::Sequence s) {
       // Object type
       requires not_<std::is_copy_constructible<T>::value>::value;
       requires not_<std::is_copy_assignable<T>::value>::value;
@@ -321,10 +322,11 @@ namespace utl {
     * \return  True if _Tp is a spi interface
     */
    template <typename _Tp>
-   constexpr bool spi_c = spi_i_details::is_spi_<_Tp>::value;
-
+   constexpr bool Spi_i = spi_i_details::is_spi_<_Tp>::value;
 #endif
-//!@}
+//! @}
+
+//! @}
 
 }  // namespace utl