diff --git a/electrum/plugins/labels/labels.py b/electrum/plugins/labels/labels.py
index a6dd40f2b..9d9d63233 100644
--- a/electrum/plugins/labels/labels.py
+++ b/electrum/plugins/labels/labels.py
@@ -39,6 +39,7 @@ class LabelsPlugin(BasePlugin):
     def encode(self, wallet: 'Abstract_Wallet', msg: str) -> str:
         password, iv, wallet_id = self.wallets[wallet]
         encrypted = aes_encrypt_with_iv(password, iv, msg.encode('utf8'))
+        # FIXME: ^ we are reusing the IV between all labels in the wallet, in CBC mode...
         return base64.b64encode(encrypted).decode()
 
     def decode(self, wallet: 'Abstract_Wallet', message: str) -> str:
@@ -66,7 +67,9 @@ class LabelsPlugin(BasePlugin):
         if not item:
             return
         if label is None:
-            # note: the server does not know whether a label is empty
+            # note: the server should not know whether a label is empty
+            #       FIXME but it does! we are reusing the IV with AES-CBC: there is no randomness between labels,
+            #       all empty labels in given wallet look the same.
             label = ''
         nonce = self.get_nonce(wallet)
         wallet_id = self.wallets[wallet][2]