- * An output to a P2WPKH, spendable exclusively by our payment key (i.e., the private key
- * which corresponds to the `payment_point` in [`ChannelSigner::pubkeys`]). The witness
- * in the spending input is, thus, simply:
+ * An output spendable exclusively by our payment key (i.e., the private key that corresponds
+ * to the `payment_point` in [`ChannelSigner::pubkeys`]). The output type depends on the
+ * channel type negotiated.
+ *
+ * On an anchor outputs channel, the witness in the spending input is:
+ * ```bitcoin
+ * <BIP 143 signature> <witness script>
+ * ```
+ *
+ * Otherwise, it is: