diff --git a/pallets/duniter-wot/src/lib.rs b/pallets/duniter-wot/src/lib.rs
index bcd64dafafc59d15314af3ced929c5e2d3fdea98..b25d29d346408f049c9dbce598b017cafb365941 100644
--- a/pallets/duniter-wot/src/lib.rs
+++ b/pallets/duniter-wot/src/lib.rs
@@ -209,6 +209,7 @@ impl<T: Config<I>, I: 'static> pallet_certification::traits::CheckCertAllowed<Id
     for Pallet<T, I>
 {
     fn check_cert_allowed(issuer: IdtyIndex, receiver: IdtyIndex) -> Result<(), DispatchError> {
+        // ensure issuer has validated identity
         if let Some(issuer_data) = pallet_identity::Pallet::<T>::identity(issuer) {
             ensure!(
                 issuer_data.status == IdtyStatus::Validated,
@@ -217,6 +218,7 @@ impl<T: Config<I>, I: 'static> pallet_certification::traits::CheckCertAllowed<Id
         } else {
             return Err(Error::<T, I>::IdtyNotFound.into());
         }
+        // ensure receiver has confirmed or validated identity
         if let Some(receiver_data) = pallet_identity::Pallet::<T>::identity(receiver) {
             match receiver_data.status {
                 IdtyStatus::ConfirmedByOwner | IdtyStatus::Validated => {} // able to receive cert
@@ -225,6 +227,9 @@ impl<T: Config<I>, I: 'static> pallet_certification::traits::CheckCertAllowed<Id
         } else {
             return Err(Error::<T, I>::IdtyNotFound.into());
         }
+        /* if T::IsSubWot::get() {
+            // in case of smith wot no additional constraint
+        } */
         Ok(())
     }
 }
diff --git a/runtime/gdev/tests/integration_tests.rs b/runtime/gdev/tests/integration_tests.rs
index b7eb8a87f20d99898a799528a1d89820668ffd2e..60783623a7d46173360d5876d90899e5ea27f432 100644
--- a/runtime/gdev/tests/integration_tests.rs
+++ b/runtime/gdev/tests/integration_tests.rs
@@ -631,6 +631,41 @@ fn test_remove_smith_identity() {
         ));
     });
 }
+use pallet_certification::Instance2;
+#[test]
+fn test_smith_certification() {
+    // 3 smith (1. alice, 2. bob, 3. charlie)
+    // 4 identities (4. dave)
+    // no identity 5. eve
+    ExtBuilder::new(1, 3, 4).build().execute_with(|| {
+        run_to_block(1);
+
+        // alice can renew smith cert to bob
+        assert_ok!(SmithCert::add_cert(
+            frame_system::RawOrigin::Signed(AccountKeyring::Alice.to_account_id()).into(),
+            1, // alice
+            2  // bob
+        ));
+
+        // bob can add new smith cert to to dave even he did not requested smith membership
+        assert_ok!(SmithCert::add_cert(
+            frame_system::RawOrigin::Signed(AccountKeyring::Bob.to_account_id()).into(),
+            2, // bob
+            4  // dave
+        ));
+
+        // charlie can not add new cert to to eve (no identity)
+        assert_noop!(
+            SmithCert::add_cert(
+                frame_system::RawOrigin::Signed(AccountKeyring::Charlie.to_account_id()).into(),
+                3, // charlie
+                5  // eve
+            ),
+            // SmithSubWot::Error::IdtyNotFound,
+            pallet_duniter_wot::Error::<gdev_runtime::Runtime, Instance2>::IdtyNotFound,
+        );
+    });
+}
 
 /// test create new account with balance lower than existential deposit
 // the treasury gets the dust