diff --git a/errors/NUQS-409.md b/errors/NUQS-409.md
new file mode 100644
index 00000000..a44bc5b5
--- /dev/null
+++ b/errors/NUQS-409.md
@@ -0,0 +1,13 @@
+# Multiple versions of the library are loaded
+
+This error occurs if two different versions of `next-usequerystate` are
+loaded in the same application.
+
+This may happen if you are using a package that embeds next-usequerystate and
+you are also using next-usequerystate directly.
+
+## Possible Solutions
+
+Inspect your dependencies for duplicate versions of `next-usequerystate` and
+use the `resolutions` field in `package.json` to force all dependencies
+to use the same version.
diff --git a/errors/NUQS-429.md b/errors/NUQS-429.md
new file mode 100644
index 00000000..0c4c23d1
--- /dev/null
+++ b/errors/NUQS-429.md
@@ -0,0 +1,15 @@
+# URL update rate-limited by the browser
+
+This error occurs when too many URL updates are attempted in a short period of
+time. For example, connecting a query state to a text input that updates on
+every keypress, or a slider (`<input type="range">`).
+
+## Possible Solutions
+
+The library has a built-in throttling mechanism, that can be configured per
+instance. See the [throttling](https://github.com/47ng/next-usequerystate#throttling)
+docs for more information.
+
+## Safari
+
+Safari has a very low rate-limit on URL updates: 100 updates per 30 seconds (or per 10 seconds on Safari 17 and above).
diff --git a/packages/next-usequerystate/src/errors.ts b/packages/next-usequerystate/src/errors.ts
new file mode 100644
index 00000000..96e9f044
--- /dev/null
+++ b/packages/next-usequerystate/src/errors.ts
@@ -0,0 +1,10 @@
+export const errors = {
+  409: 'Multiple versions of the library are loaded. This may lead to unexpected behavior. Currently using %s, but %s was about to load on top.',
+  429: 'URL update rate-limited by the browser. Consider increasing `throttleMs` for keys %s. %O'
+} as const
+
+export function error(code: keyof typeof errors, ...args: any[]) {
+  const message = `[next-usequerystate] ${errors[code]}
+  See https://err.sh/47ng/next-usequerystate/NUQS-${code}`
+  console.error(message, ...args)
+}
diff --git a/packages/next-usequerystate/src/sync.ts b/packages/next-usequerystate/src/sync.ts
index 9568f61b..ae388c18 100644
--- a/packages/next-usequerystate/src/sync.ts
+++ b/packages/next-usequerystate/src/sync.ts
@@ -1,5 +1,6 @@
 import Mitt from 'mitt'
 import { debug } from './debug'
+import { error } from './errors'
 import { getQueuedValue } from './update-queue'
 
 export const SYNC_EVENT_KEY = Symbol('__nextUseQueryState__SYNC__')
@@ -44,12 +45,7 @@ function patchHistory() {
   const patched = history.__nextUseQueryState_patched
   if (patched) {
     if (patched !== version) {
-      // todo: Make this a URL error with more details and resolution instructions
-      console.warn(
-        '[next-usequerystate] Multiple versions of the library are loaded. This may lead to unexpected behavior. Currently using %s, but %s was about to load on top.',
-        patched,
-        version
-      )
+      error(409, patched, version)
     }
     return
   }
diff --git a/packages/next-usequerystate/src/update-queue.ts b/packages/next-usequerystate/src/update-queue.ts
index 61c790e3..a2bac014 100644
--- a/packages/next-usequerystate/src/update-queue.ts
+++ b/packages/next-usequerystate/src/update-queue.ts
@@ -1,5 +1,6 @@
 import { debug } from './debug'
 import type { Options, Router } from './defs'
+import { error } from './errors'
 import { NOSYNC_MARKER } from './sync'
 import { renderQueryString } from './url-encoding'
 import { getDefaultThrottle } from './utils'
@@ -161,12 +162,10 @@ function flushUpdateQueue(router: Router): [URLSearchParams, null | unknown] {
       })
     }
     return [search, null]
-  } catch (error) {
-    console.error(
-      // This may fail due to rate-limiting of history methods,
-      // for example Safari only allows 100 updates in a 30s window.
-      `useQueryState error updating URL: ${error}`
-    )
+  } catch (err) {
+    // This may fail due to rate-limiting of history methods,
+    // for example Safari only allows 100 updates in a 30s window.
+    error(429, items.map(([key]) => key).join(), err)
     return [search, error]
   }
 }