diff --git a/deltachat-jsonrpc/src/api.rs b/deltachat-jsonrpc/src/api.rs
index 8619e3c47b..465fbc79a5 100644
--- a/deltachat-jsonrpc/src/api.rs
+++ b/deltachat-jsonrpc/src/api.rs
@@ -985,7 +985,9 @@ impl CommandApi {
     /// Create a new unencrypted group chat.
     ///
     /// Same as [`Self::create_group_chat`], but the chat is unencrypted and can only have
-    /// address-contacts.
+    /// address-contacts. NB: Chats with similar names and the same members are merged on other
+    /// devices, but usually users don't create such chats and look up the existing one instead, so
+    /// chat split on the first device is acceptable.
     async fn create_group_chat_unencrypted(&self, account_id: u32, name: String) -> Result<u32> {
         let ctx = self.get_context(account_id).await?;
         chat::create_group_ex(&ctx, None, &name)
diff --git a/src/chat.rs b/src/chat.rs
index d0862a1d40..f3b959f016 100644
--- a/src/chat.rs
+++ b/src/chat.rs
@@ -3712,6 +3712,10 @@ pub async fn create_group_chat(
 ///
 /// * `encryption` - If `Some`, the chat is encrypted (with key-contacts) and can be protected.
 /// * `name` - Chat name.
+///
+/// NB: Unencrypted chats with similar names and the same members are merged on other devices, but
+/// usually users don't create such chats and look up the existing one instead, so chat split on the
+/// first device is acceptable.
 pub async fn create_group_ex(
     context: &Context,
     encryption: Option<ProtectionStatus>,