diff --git a/docs/release-notes.md b/docs/release-notes.md
index aea4dbab..3be90208 100644
--- a/docs/release-notes.md
+++ b/docs/release-notes.md
@@ -18,6 +18,7 @@
 * For the web UI:
   * Added log download option.
   * Fixed log parser not correctly handling multiple mods having the exact same name.
+  * Fixed JSON validator not recognizing manifest [update subkeys](https://stardewvalleywiki.com/Modding:Modder_Guide/APIs/Update_checks#Update_subkeys).
 
 ## 3.13.2
 Released 05 December 2021 for Stardew Valley 1.5.5 or later.
diff --git a/src/SMAPI.Web/wwwroot/schemas/manifest.json b/src/SMAPI.Web/wwwroot/schemas/manifest.json
index 05698ba2..b6722347 100644
--- a/src/SMAPI.Web/wwwroot/schemas/manifest.json
+++ b/src/SMAPI.Web/wwwroot/schemas/manifest.json
@@ -103,7 +103,7 @@
             "type": "array",
             "items": {
                 "type": "string",
-                "pattern": "^(?i)(Chucklefish:\\d+|Nexus:\\d+|GitHub:[A-Za-z0-9_\\-]+/[A-Za-z0-9_\\-]+|ModDrop:\\d+)$",
+                "pattern": "^(?i)(Chucklefish:\\d+|Nexus:\\d+|GitHub:[A-Za-z0-9_\\-]+/[A-Za-z0-9_\\-]+|ModDrop:\\d+)(?: *@ *[a-zA-Z0-9_]+ *)$",
                 "@errorMessages": {
                     "pattern": "Invalid update key; see https://stardewvalleywiki.com/Modding:Modder_Guide/APIs/Manifest#Update_checks for more info."
                 }