diff --git a/Comments:BIP-0174.md b/Comments:BIP-0174.md
index 85e05b2..e70613b 100644
--- a/Comments:BIP-0174.md
+++ b/Comments:BIP-0174.md
@@ -3,3 +3,13 @@
 * Partial signature entries use the map key `{0x02}|{public key}`.  However, a single public key may be involved in signing multiple inputs, and the signature will differ in each one.  Since the map keys are to be unique, this is a problem.  I suggest the following map key instead: `{0x02}|{input index}|{pubkey index}`
 
 * HD derivation entries waste space by repeating the public key.  I recommend using the following map key instead: `{0x03}|{input index}|{pubkey index}`, which also matches previous point.
+
+## In response to Dev Random from achow101
+
+> However, a single public key may be involved in signing multiple inputs, and the signature will differ in each one.  Since the map keys are to be unique, this is a problem.
+
+Each input has its own partial signatures map; it isn't global.
+
+> HD derivation entries waste space by repeating the public key.  I recommend using the following map key instead: `{0x03}|{input index}|{pubkey index}`, which also matches previous point.
+
+The hd keypaths (unlike the partial signatures map) is global. Public keys are not duplicated in the map.