diff --git a/cmd/lncli/cmd_invoice.go b/cmd/lncli/cmd_invoice.go
index 87686d013..3419f8192 100644
--- a/cmd/lncli/cmd_invoice.go
+++ b/cmd/lncli/cmd_invoice.go
@@ -57,8 +57,8 @@ var addInvoiceCommand = cli.Command{
 		cli.Int64Flag{
 			Name: "expiry",
 			Usage: "the invoice's expiry time in seconds. If not " +
-				"specified an expiry of 3600 seconds (1 hour) " +
-				"is implied.",
+				"specified, an expiry of " +
+				"86400 seconds (24 hours) is implied.",
 		},
 		cli.BoolFlag{
 			Name: "private",
diff --git a/cmd/lncli/invoicesrpc_active.go b/cmd/lncli/invoicesrpc_active.go
index 17a5e1abb..095911b66 100644
--- a/cmd/lncli/invoicesrpc_active.go
+++ b/cmd/lncli/invoicesrpc_active.go
@@ -181,8 +181,8 @@ var addHoldInvoiceCommand = cli.Command{
 		cli.Int64Flag{
 			Name: "expiry",
 			Usage: "the invoice's expiry time in seconds. If not " +
-				"specified, an expiry of 3600 seconds (1 hour) " +
-				"is implied.",
+				"specified, an expiry of " +
+				"86400 seconds (24 hours) is implied.",
 		},
 		cli.BoolFlag{
 			Name: "private",
diff --git a/docs/release-notes/release-notes-0.16.0.md b/docs/release-notes/release-notes-0.16.0.md
index 977a69a26..58c9c5f62 100644
--- a/docs/release-notes/release-notes-0.16.0.md
+++ b/docs/release-notes/release-notes-0.16.0.md
@@ -197,6 +197,8 @@ certain large transactions](https://github.com/lightningnetwork/lnd/pull/7100).
   that caused additional failure message data to be interpreted as being part of
   a channel update.
 
+* [Fix addinvoice expiry flag comment](https://github.com/lightningnetwork/lnd/pull/7306).
+
 ## `lncli`
 
 * [Add an `insecure` flag to skip tls auth as well as a `metadata` string slice
@@ -366,3 +368,4 @@ refactor the itest for code health and maintenance.
 * Roei Erez
 * Tommy Volk
 * Yong Yu
+* Yusuke Shimizu
diff --git a/lnrpc/invoicesrpc/invoices.pb.go b/lnrpc/invoicesrpc/invoices.pb.go
index f4f56dccf..12fdd7cef 100644
--- a/lnrpc/invoicesrpc/invoices.pb.go
+++ b/lnrpc/invoicesrpc/invoices.pb.go
@@ -188,7 +188,7 @@ type AddHoldInvoiceRequest struct {
 	// payment (memo) is too long to naturally fit within the description field
 	// of an encoded payment request.
 	DescriptionHash []byte `protobuf:"bytes,4,opt,name=description_hash,json=descriptionHash,proto3" json:"description_hash,omitempty"`
-	// Payment request expiry time in seconds. Default is 3600 (1 hour).
+	// Payment request expiry time in seconds. Default is 86400 (24 hours).
 	Expiry int64 `protobuf:"varint,5,opt,name=expiry,proto3" json:"expiry,omitempty"`
 	// Fallback on-chain address.
 	FallbackAddr string `protobuf:"bytes,6,opt,name=fallback_addr,json=fallbackAddr,proto3" json:"fallback_addr,omitempty"`
diff --git a/lnrpc/invoicesrpc/invoices.proto b/lnrpc/invoicesrpc/invoices.proto
index f98c64a03..12317d02c 100644
--- a/lnrpc/invoicesrpc/invoices.proto
+++ b/lnrpc/invoicesrpc/invoices.proto
@@ -84,7 +84,7 @@ message AddHoldInvoiceRequest {
     */
     bytes description_hash = 4;
 
-    // Payment request expiry time in seconds. Default is 3600 (1 hour).
+    // Payment request expiry time in seconds. Default is 86400 (24 hours).
     int64 expiry = 5;
 
     // Fallback on-chain address.
diff --git a/lnrpc/invoicesrpc/invoices.swagger.json b/lnrpc/invoicesrpc/invoices.swagger.json
index 6dee4c978..2fca20090 100644
--- a/lnrpc/invoicesrpc/invoices.swagger.json
+++ b/lnrpc/invoicesrpc/invoices.swagger.json
@@ -261,7 +261,7 @@
         "expiry": {
           "type": "string",
           "format": "int64",
-          "description": "Payment request expiry time in seconds. Default is 3600 (1 hour)."
+          "description": "Payment request expiry time in seconds. Default is 86400 (24 hours)."
         },
         "fallback_addr": {
           "type": "string",
@@ -493,7 +493,7 @@
         "expiry": {
           "type": "string",
           "format": "int64",
-          "description": "Payment request expiry time in seconds. Default is 3600 (1 hour)."
+          "description": "Payment request expiry time in seconds. Default is 86400 (24 hours)."
         },
         "fallback_addr": {
           "type": "string",
diff --git a/lnrpc/lightning.pb.go b/lnrpc/lightning.pb.go
index 45e68d161..26854d3d7 100644
--- a/lnrpc/lightning.pb.go
+++ b/lnrpc/lightning.pb.go
@@ -11635,7 +11635,7 @@ type Invoice struct {
 	// of an encoded payment request. When using REST, this field must be encoded
 	// as base64.
 	DescriptionHash []byte `protobuf:"bytes,10,opt,name=description_hash,json=descriptionHash,proto3" json:"description_hash,omitempty"`
-	// Payment request expiry time in seconds. Default is 3600 (1 hour).
+	// Payment request expiry time in seconds. Default is 86400 (24 hours).
 	Expiry int64 `protobuf:"varint,11,opt,name=expiry,proto3" json:"expiry,omitempty"`
 	// Fallback on-chain address.
 	FallbackAddr string `protobuf:"bytes,12,opt,name=fallback_addr,json=fallbackAddr,proto3" json:"fallback_addr,omitempty"`
diff --git a/lnrpc/lightning.proto b/lnrpc/lightning.proto
index 3b4294a17..62bf7ad42 100644
--- a/lnrpc/lightning.proto
+++ b/lnrpc/lightning.proto
@@ -3394,7 +3394,7 @@ message Invoice {
     */
     bytes description_hash = 10;
 
-    // Payment request expiry time in seconds. Default is 3600 (1 hour).
+    // Payment request expiry time in seconds. Default is 86400 (24 hours).
     int64 expiry = 11;
 
     // Fallback on-chain address.
diff --git a/lnrpc/lightning.swagger.json b/lnrpc/lightning.swagger.json
index 85b94f6fc..68faf1bd7 100644
--- a/lnrpc/lightning.swagger.json
+++ b/lnrpc/lightning.swagger.json
@@ -5060,7 +5060,7 @@
         "expiry": {
           "type": "string",
           "format": "int64",
-          "description": "Payment request expiry time in seconds. Default is 3600 (1 hour)."
+          "description": "Payment request expiry time in seconds. Default is 86400 (24 hours)."
         },
         "fallback_addr": {
           "type": "string",