diff --git a/src/main/kotlin/org/briarproject/briar/desktop/contact/add/remote/AddContactDialog.kt b/src/main/kotlin/org/briarproject/briar/desktop/contact/add/remote/AddContactDialog.kt
index f2a7fcca1f805fb0081535195e1bcd9efe34e4cb..1ea6c34601a06ec891ca6aa15422238ea3481551 100644
--- a/src/main/kotlin/org/briarproject/briar/desktop/contact/add/remote/AddContactDialog.kt
+++ b/src/main/kotlin/org/briarproject/briar/desktop/contact/add/remote/AddContactDialog.kt
@@ -43,10 +43,10 @@ import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.sp
 import org.briarproject.briar.desktop.contact.add.remote.AddContactViewModel.AddContactError
 import org.briarproject.briar.desktop.contact.add.remote.AddContactViewModel.AliasInvalidError
-import org.briarproject.briar.desktop.contact.add.remote.AddContactViewModel.ErrorContactAlreadyExists
-import org.briarproject.briar.desktop.contact.add.remote.AddContactViewModel.ErrorPendingAlreadyExists
+import org.briarproject.briar.desktop.contact.add.remote.AddContactViewModel.ContactAlreadyExistsError
 import org.briarproject.briar.desktop.contact.add.remote.AddContactViewModel.LinkInvalidError
 import org.briarproject.briar.desktop.contact.add.remote.AddContactViewModel.OwnLinkError
+import org.briarproject.briar.desktop.contact.add.remote.AddContactViewModel.PendingAlreadyExistsError
 import org.briarproject.briar.desktop.contact.add.remote.AddContactViewModel.PublicKeyInvalidError
 import org.briarproject.briar.desktop.contact.add.remote.AddContactViewModel.RemoteInvalidError
 import org.briarproject.briar.desktop.dialogs.DialogType.ERROR
@@ -68,7 +68,7 @@ fun main() = preview(
     "local link" to link,
     "alias" to "Alice",
     "error visible" to false,
-    "error type" to PreviewUtils.Values(
+    "error type" to PreviewUtils.DropDownValues(
         0,
         listOf(
             OwnLinkError::class.simpleName!!,
@@ -76,8 +76,8 @@ fun main() = preview(
             AliasInvalidError::class.simpleName!!,
             LinkInvalidError::class.simpleName!!,
             PublicKeyInvalidError::class.simpleName!!,
-            ErrorContactAlreadyExists::class.simpleName!!,
-            ErrorPendingAlreadyExists::class.simpleName!!,
+            ContactAlreadyExistsError::class.simpleName!!,
+            PendingAlreadyExistsError::class.simpleName!!,
         )
     ),
 ) {
@@ -96,16 +96,16 @@ fun main() = preview(
     )
 }
 
-fun PreviewUtils.PreviewScope.mapErrors(name: String?): AddContactError? = when (name) {
+private fun PreviewUtils.PreviewScope.mapErrors(name: String?): AddContactError? = when (name) {
     OwnLinkError::class.simpleName!! -> OwnLinkError(link)
     RemoteInvalidError::class.simpleName!! -> RemoteInvalidError(link)
     AliasInvalidError::class.simpleName!! -> AliasInvalidError(link, "")
     LinkInvalidError::class.simpleName!! -> LinkInvalidError(link)
     PublicKeyInvalidError::class.simpleName!! -> PublicKeyInvalidError(link)
-    ErrorContactAlreadyExists::class.simpleName!! -> ErrorContactAlreadyExists(
+    ContactAlreadyExistsError::class.simpleName!! -> ContactAlreadyExistsError(
         link, "David", getStringParameter("alias")
     )
-    ErrorPendingAlreadyExists::class.simpleName!! -> ErrorPendingAlreadyExists(
+    PendingAlreadyExistsError::class.simpleName!! -> PendingAlreadyExistsError(
         link, "Frank", getStringParameter("alias")
     )
     else -> null
@@ -248,12 +248,12 @@ fun errorMessage(error: AddContactError) = when (error) {
         ERROR, i18n("error"),
         i18nF("introduction.error.public_key_invalid", error.link)
     )
-    is ErrorContactAlreadyExists -> {
+    is ContactAlreadyExistsError -> {
         val intro = i18nF("introduction.error.contact_already_exists", error.existingName)
         var explanation = i18nF("introduction.error.duplicate_contact_explainer", error.existingName, error.alias)
         Triple(WARNING, i18n("introduction.error.adding_failed"), (intro + "\n\n" + explanation))
     }
-    is ErrorPendingAlreadyExists -> {
+    is PendingAlreadyExistsError -> {
         val intro = i18nF("introduction.error.pending_contact_already_exists", error.existingAlias)
         var explanation = i18nF("introduction.error.duplicate_contact_explainer", error.existingAlias, error.alias)
         Triple(WARNING, i18n("introduction.error.adding_failed"), (intro + "\n\n" + explanation))
diff --git a/src/main/kotlin/org/briarproject/briar/desktop/contact/add/remote/AddContactViewModel.kt b/src/main/kotlin/org/briarproject/briar/desktop/contact/add/remote/AddContactViewModel.kt
index 235d1cec4261fbc4d7d07fd0b5fa8b9e97da2a47..7794117494d78ee68c6300a862657d5c248f946e 100644
--- a/src/main/kotlin/org/briarproject/briar/desktop/contact/add/remote/AddContactViewModel.kt
+++ b/src/main/kotlin/org/briarproject/briar/desktop/contact/add/remote/AddContactViewModel.kt
@@ -56,10 +56,10 @@ constructor(
     data class LinkInvalidError(val link: String) : AddContactError
     data class PublicKeyInvalidError(val link: String) : AddContactError
 
-    data class ErrorContactAlreadyExists(val link: String, val existingName: String, val alias: String) :
+    data class ContactAlreadyExistsError(val link: String, val existingName: String, val alias: String) :
         AddContactError
 
-    data class ErrorPendingAlreadyExists(val link: String, val existingAlias: String, val alias: String) :
+    data class PendingAlreadyExistsError(val link: String, val existingAlias: String, val alias: String) :
         AddContactError
 
     override fun onInit() {
@@ -150,18 +150,15 @@ constructor(
                 _error.value = PublicKeyInvalidError(link)
             }
             /*
-            TODO: Warn user that the following two errors might be an attack
-
-             Use `e.pendingContact.id.bytes` and `e.pendingContact.alias` to implement the following logic:
-             https://code.briarproject.org/briar/briar-gtk/-/merge_requests/97
-
+            TODO: Improve warnings about potential attacks implemented here.
+             See https://code.briarproject.org/briar/briar-desktop/-/issues/240
             */
             catch (e: ContactExistsException) {
                 LOG.warn { "Contact already exists: $link" }
-                _error.value = ErrorContactAlreadyExists(link, e.remoteAuthor.name, alias)
+                _error.value = ContactAlreadyExistsError(link, e.remoteAuthor.name, alias)
             } catch (e: PendingContactExistsException) {
                 LOG.warn { "Pending contact already exists: $link" }
-                _error.value = ErrorPendingAlreadyExists(link, e.pendingContact.alias, alias)
+                _error.value = PendingAlreadyExistsError(link, e.pendingContact.alias, alias)
             }
         }
     }
diff --git a/src/main/kotlin/org/briarproject/briar/desktop/utils/PreviewUtils.kt b/src/main/kotlin/org/briarproject/briar/desktop/utils/PreviewUtils.kt
index cbe270a48448d283db5a339c59574bd806c109f1..6e5bc55029bbf847d37683e64f283e69b256bd6f 100644
--- a/src/main/kotlin/org/briarproject/briar/desktop/utils/PreviewUtils.kt
+++ b/src/main/kotlin/org/briarproject/briar/desktop/utils/PreviewUtils.kt
@@ -162,7 +162,7 @@ object PreviewUtils {
     @Composable
     private fun PreviewScope.addDropDownParameter(
         name: String,
-        initial: Values,
+        initial: DropDownValues,
     ) {
         var expanded by remember { mutableStateOf(false) }
         val items = initial.values
@@ -220,7 +220,7 @@ object PreviewUtils {
                                 is Long -> scope.addLongParameter(name, initial)
                                 is Float -> scope.addFloatParameter(name, initial)
                                 is FloatSlider -> scope.addFloatSliderParameter(name, initial)
-                                is Values -> scope.addDropDownParameter(name, initial)
+                                is DropDownValues -> scope.addDropDownParameter(name, initial)
                                 else -> throw IllegalArgumentException("Type ${initial::class.simpleName} is not supported for previewing.")
                             }
                         }
@@ -244,7 +244,7 @@ object PreviewUtils {
         val max: Float,
     )
 
-    data class Values(
+    data class DropDownValues(
         val initial: Int,
         val values: List<String>,
     )