diff --git a/source/_posts/caddy-nixos-part-3.md b/source/_posts/caddy-nixos-part-3.md
index b8604ca..4fcea44 100644
--- a/source/_posts/caddy-nixos-part-3.md
+++ b/source/_posts/caddy-nixos-part-3.md
@@ -101,6 +101,7 @@ in {
       environment = mkIf (versionAtLeast config.system.stateVersion "17.09")
         { CADDYPATH = cfg.dataDir; };
       startLimitIntervalSec = 86400;
+      # 21.03+
       # https://github.com/NixOS/nixpkgs/pull/97512
       # startLimitBurst = 5;
       serviceConfig = {
@@ -112,7 +113,7 @@ in {
         User = "caddyProxy";
         Group = "caddyProxy";
         Restart = "on-failure";
-        # <= 20.03
+        # <= 20.09
         StartLimitBurst = 5;
         NoNewPrivileges = true;
         LimitNPROC = 64;
diff --git a/source/_posts/caddy-v2-nixos.md b/source/_posts/caddy-v2-nixos.md
index bff0718..32ecf1f 100644
--- a/source/_posts/caddy-v2-nixos.md
+++ b/source/_posts/caddy-v2-nixos.md
@@ -80,6 +80,7 @@ in {
       environment = mkIf (versionAtLeast config.system.stateVersion "17.09" && !isCaddy2)
         { CADDYPATH = cfg.dataDir; };
       startLimitIntervalSec = 86400;
+      # 21.03+
       # https://github.com/NixOS/nixpkgs/pull/97512
       # startLimitBurst = 5;
       serviceConfig = {
@@ -91,7 +92,7 @@ in {
         User = "caddyProxy";
         Group = "caddyProxy";
         Restart = "on-failure";
-        # <= 20.03
+        # <= 20.09
         StartLimitBurst = 5;
         NoNewPrivileges = true;
         LimitNPROC = 64;
diff --git a/source/_posts/i2p-eepsite-nixos.md b/source/_posts/i2p-eepsite-nixos.md
index bf7600c..fbb36ac 100644
--- a/source/_posts/i2p-eepsite-nixos.md
+++ b/source/_posts/i2p-eepsite-nixos.md
@@ -149,6 +149,7 @@ in {
       environment = mkIf (versionAtLeast config.system.stateVersion "17.09")
         { CADDYPATH = cfg.dataDir; };
       startLimitIntervalSec = 86400;
+      # 21.03+
       # https://github.com/NixOS/nixpkgs/pull/97512
       # startLimitBurst = 5;
       serviceConfig = {
@@ -160,7 +161,7 @@ in {
         User = "caddyProxy";
         Group = "caddyProxy";
         Restart = "on-failure";
-        # <= 20.03
+        # <= 20.09
         StartLimitBurst = 5;
         NoNewPrivileges = true;
         LimitNPROC = 64;
diff --git a/source/_posts/tor-hidden-onion-nixos.md b/source/_posts/tor-hidden-onion-nixos.md
index d52df85..e873fbf 100644
--- a/source/_posts/tor-hidden-onion-nixos.md
+++ b/source/_posts/tor-hidden-onion-nixos.md
@@ -124,6 +124,7 @@ in {
       environment = mkIf (versionAtLeast config.system.stateVersion "17.09")
         { CADDYPATH = cfg.dataDir; };
       startLimitIntervalSec = 86400;
+      # 21.03+
       # https://github.com/NixOS/nixpkgs/pull/97512
       # startLimitBurst = 5;
       serviceConfig = {
@@ -135,7 +136,7 @@ in {
         User = "caddyProxy";
         Group = "caddyProxy";
         Restart = "on-failure";
-        # <= 20.03
+        # <= 20.09
         StartLimitBurst = 5;
         NoNewPrivileges = true;
         LimitNPROC = 64;