diff --git a/documentation/docs/02-runes/02-$state.md b/documentation/docs/02-runes/02-$state.md
index d763b6578f..b90c71366a 100644
--- a/documentation/docs/02-runes/02-$state.md
+++ b/documentation/docs/02-runes/02-$state.md
@@ -167,6 +167,8 @@ To take a static snapshot of a deeply reactive `$state` proxy, use `$state.snaps
 
 This is handy when you want to pass some state to an external library or API that doesn't expect a proxy, such as `structuredClone`.
 
+If a value has a `toJSON` method, the snapshot will clone the value returned from `toJSON` instead of the original object.
+
 ## `$state.eager`
 
 When state changes, it may not be reflected in the UI immediately if it is used by an `await` expression, because [updates are synchronized](await-expressions#Synchronized-updates).
diff --git a/packages/svelte/src/ambient.d.ts b/packages/svelte/src/ambient.d.ts
index 159a568477..bbbc86c997 100644
--- a/packages/svelte/src/ambient.d.ts
+++ b/packages/svelte/src/ambient.d.ts
@@ -147,6 +147,8 @@ declare namespace $state {
 	 * </script>
 	 * ```
 	 *
+	 * If `state` has a `toJSON` method, the snapshot will clone the value returned from `toJSON` instead of the original object.
+	 *
 	 * @see {@link https://svelte.dev/docs/svelte/$state#$state.snapshot Documentation}
 	 *
 	 * @param state The value to snapshot
diff --git a/packages/svelte/types/index.d.ts b/packages/svelte/types/index.d.ts
index 019baf45dd..3f71d44177 100644
--- a/packages/svelte/types/index.d.ts
+++ b/packages/svelte/types/index.d.ts
@@ -3345,6 +3345,8 @@ declare namespace $state {
 	 * </script>
 	 * ```
 	 *
+	 * If `state` has a `toJSON` method, the snapshot will clone the value returned from `toJSON` instead of the original object.
+	 *
 	 * @see {@link https://svelte.dev/docs/svelte/$state#$state.snapshot Documentation}
 	 *
 	 * @param state The value to snapshot