diff --git a/lnrpc/invoicesrpc/invoices.proto b/lnrpc/invoicesrpc/invoices.proto
index 12317d02c22..1df9192516b 100644
--- a/lnrpc/invoicesrpc/invoices.proto
+++ b/lnrpc/invoicesrpc/invoices.proto
@@ -122,7 +122,8 @@ message AddHoldInvoiceResp {
     /*
     The payment address of the generated invoice. This value should be used
     in all payments for this invoice as we require it for end to end
-    security.
+    security.The term payment_secret, sometimes used interchangeably with 
+    payment_addr, holds significance in different scenarios.
     */
     bytes payment_addr = 3;
 }
@@ -156,9 +157,10 @@ enum LookupModifier {
 
     /*
     Indicates that when a look up is done using a payment_addr, then no HTLCs
-    related to the payment_addr should be returned. This is useful when one
-    wants to be able to obtain the set of associated setIDs with a given
-    invoice, then look up the sub-invoices "projected" by that set ID.
+    related to the payment_addr should be returned. This is useful 
+    when one wants to be able to obtain the set of associated 
+    setIDs with a given invoice, then look up the sub-invoices 
+    "projected" by that set ID.
     */
     HTLC_SET_BLANK = 2;
 }
diff --git a/lnrpc/lightning.proto b/lnrpc/lightning.proto
index 12f3a55bf5b..1cd4bb50e90 100644
--- a/lnrpc/lightning.proto
+++ b/lnrpc/lightning.proto
@@ -877,7 +877,8 @@ message SendRequest {
     repeated FeatureBit dest_features = 15;
 
     /*
-    The payment address of the generated invoice.
+    The payment address of the generated invoice. The term payment_secret 
+    may also refer to the payment address in certain contexts.
     */
     bytes payment_addr = 16;
 }
@@ -3107,7 +3108,8 @@ message MPPRecord {
     A unique, random identifier used to authenticate the sender as the intended
     payer of a multi-path payment. The payment_addr must be the same for all
     subpayments, and match the payment_addr provided in the receiver's invoice.
-    The same payment_addr must be used on all subpayments.
+    The same payment_addr must be used on all subpayments.The term 
+    payment_secret may also refer to the payment address in certain contexts.
     */
     bytes payment_addr = 11;
 
@@ -3631,7 +3633,8 @@ message Invoice {
     bool is_keysend = 25;
 
     /*
-    The payment address of this invoice. This value will be used in MPP
+    The payment address of this invoice. Other contexts may designate the 
+    payment_addr as the payment_secret. This value will be used in MPP
     payments, and also for newer invoices that always require the MPP payload
     for added end-to-end security.
     Note: Output only, don't specify for creating an invoice.
@@ -3740,7 +3743,8 @@ message AddInvoiceResponse {
     /*
     The payment address of the generated invoice. This value should be used
     in all payments for this invoice as we require it for end to end
-    security.
+    security. In various situations, the payment_secret is used as an 
+    alternative term for payment_addr.
     */
     bytes payment_addr = 17;
 }
diff --git a/lnrpc/routerrpc/router.proto b/lnrpc/routerrpc/router.proto
index d591cc485ca..0574a697d12 100644
--- a/lnrpc/routerrpc/router.proto
+++ b/lnrpc/routerrpc/router.proto
@@ -180,7 +180,9 @@ message SendPaymentRequest {
     */
     int32 final_cltv_delta = 4;
 
-    // An optional payment addr to be included within the last hop of the route.
+    /* An optional payment addr to be included within the last hop of the route.
+    This field is also called "payment_secret" in other context.
+    */
     bytes payment_addr = 20;
 
     /*
@@ -634,7 +636,11 @@ message BuildRouteRequest {
     */
     repeated bytes hop_pubkeys = 4;
 
-    // An optional payment addr to be included within the last hop of the route.
+    /*
+    An optional payment addr to be included within the last hop of the route.
+    In various situations, the payment_secret is used as an alternative term 
+    for payment_addr.
+    */
     bytes payment_addr = 5;
 }