diff --git a/src/libboard_artiq/src/cxp.rs b/src/libboard_artiq/src/cxp.rs
index 5a2058b..e69bfcd 100644
--- a/src/libboard_artiq/src/cxp.rs
+++ b/src/libboard_artiq/src/cxp.rs
@@ -233,6 +233,7 @@ fn negotiate_cxp_version() -> Result<bool, Error> {
 }
 
 fn negotiate_pak_max_size(with_tag: bool) -> Result<(), Error> {
+    // TODO: set MAX CONTROL packet size?
     let reg = read_u32(MASTER_CHANNEL, CONTROL_PACKET_SIZE_MAX, with_tag)?;
     info!("Max CTRL PAK size = {:#010X}", reg);