diff --git a/include/utl/meta/invoke.h b/include/utl/meta/invoke.h
index 6c61c9a..71da809 100644
--- a/include/utl/meta/invoke.h
+++ b/include/utl/meta/invoke.h
@@ -1,5 +1,5 @@
 /*!
- * \file    utility.h
+ * \file    invoke.h
  * \brief   Template meta-programming utilities
  *
  * Copyright (C) 2018 Christos Choutouridis
@@ -17,17 +17,18 @@
  * You should have received a copy of the GNU Lesser General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
-#ifndef __utl_meta_utility_h__
-#define __utl_meta_utility_h__
+#ifndef __utl_meta_invoke_h__
+#define __utl_meta_invoke_h__
 
 #include <utl/core/impl.h>
 #include <utl/meta/integral.h>
 #include <utl/meta/void.h>
 #include <utl/meta/selection.h>
+#include <utl/meta/logical.h>
 
 /*!
  * \ingroup meta
- * \defgroup utility
+ * \defgroup invoke
  *
  */
 //! @{
diff --git a/include/utl/meta/meta.h b/include/utl/meta/meta.h
index 16966e5..1f0bdb9 100644
--- a/include/utl/meta/meta.h
+++ b/include/utl/meta/meta.h
@@ -29,5 +29,6 @@
 #include <utl/meta/operations.h>
 #include <utl/meta/useif.h>
 
+#include <utl/meta/invoke.h>
 
 #endif /* __utl_meta_meta_h__ */
diff --git a/include/utl/meta/typelist.h b/include/utl/meta/typelist.h
index d490b3d..d40e8bd 100644
--- a/include/utl/meta/typelist.h
+++ b/include/utl/meta/typelist.h
@@ -24,8 +24,8 @@
 #include <utl/meta/integral.h>
 #include <utl/meta/idx_sequence.h>
 #include <utl/meta/void.h>
-#include <utl/meta/utility.h>
-
+#include <utl/meta/invoke.h>
+#include <utl/meta/sfinae.h>
 /*!
  * \ingroup meta
  * \defgroup typelist