diff --git a/primitives/xcm/src/lib.rs b/primitives/xcm/src/lib.rs
index 1c3609f..75a7171 100644
--- a/primitives/xcm/src/lib.rs
+++ b/primitives/xcm/src/lib.rs
@@ -14,6 +14,10 @@
 // You should have received a copy of the GNU General Public License
 // along with Moonkit.  If not, see <http://www.gnu.org/licenses/>.
 
+//! The XCM primitive trait implementations
+
+#![cfg_attr(not(feature = "std"), no_std)]
+
 use sp_runtime::DispatchResult;
 
 /// Pause and resume execution of XCM