diff --git a/liteeth/core/icmp.py b/liteeth/core/icmp.py
index 6b81be5..85bf796 100644
--- a/liteeth/core/icmp.py
+++ b/liteeth/core/icmp.py
@@ -125,6 +125,7 @@ class LiteEthICMPEcho(Module):
 
         # # #
 
+        # TODO: optimize ressources (no need to store parameters as datas)
         self.submodules.buffer = Buffer(eth_icmp_user_description(8), 128, 2)
         self.comb += [
             Record.connect(sink, self.buffer.sink),
diff --git a/liteeth/frontend/etherbone.py b/liteeth/frontend/etherbone.py
index baa5f1e..a9116a7 100644
--- a/liteeth/frontend/etherbone.py
+++ b/liteeth/frontend/etherbone.py
@@ -188,6 +188,7 @@ class LiteEthEtherboneRecordReceiver(Module):
 
         # # #
 
+        # TODO: optimize ressources (no need to store parameters as datas)
         fifo = SyncFIFO(eth_etherbone_record_description(32), buffer_depth,
                         buffered=True)
         self.submodules += fifo
@@ -263,6 +264,7 @@ class LiteEthEtherboneRecordSender(Module):
 
         # # #
 
+        # TODO: optimize ressources (no need to store parameters as datas)
         pbuffer = Buffer(eth_etherbone_mmap_description(32), buffer_depth)
         self.submodules += pbuffer
         self.comb += Record.connect(sink, pbuffer.sink)