diff --git a/ext-dynamic-commitments.md b/ext-dynamic-commitments.md
index 78e88f02e..6d39d9d59 100644
--- a/ext-dynamic-commitments.md
+++ b/ext-dynamic-commitments.md
@@ -89,11 +89,17 @@ remaining after we filter out these values is thus:
 - `max_accepted_htlcs`
 - `funding_pubkey`
 - `channel_flags`
-- `channel_type`
+- channel_type<sup>*</sup>
 
 The design presented here is intended to allow for arbitrary changes to these
 values that currently have no facilities for change in any other way.
 
+<sup>*</sup>`channel_type` can be updated using Dynamic Commitments only if the
+funding output scripts are identical between the `channel_type` prior to the
+change and following it.
+
+TODO: list allowed channel_type conversions here.
+
 ## Design Overview
 
 The main goal of this proposal is to be able to change all of the historically