diff --git a/packages/types/custom/CHANGELOG.md b/packages/types/custom/CHANGELOG.md
index 15d75c571..bf2ba3460 100644
--- a/packages/types/custom/CHANGELOG.md
+++ b/packages/types/custom/CHANGELOG.md
@@ -1,5 +1,9 @@
 # CHANGELOG
 
+## unpublished
+
+- Fix: Add `string` as option for `SearchType` since arbitrary strings can be registered.
+
 ## 1.4.1
 
 - Fix: Increase type precision of EPSG codes from `string` to `EPSG:${string}`.
diff --git a/packages/types/custom/core.ts b/packages/types/custom/core.ts
index edd59cb1a..dc8cdaa25 100644
--- a/packages/types/custom/core.ts
+++ b/packages/types/custom/core.ts
@@ -35,7 +35,7 @@ export interface PluginOptions {
 export type RenderType = 'iconMenu' | 'independent'
 
 /** Possible search methods by type */
-export type SearchType = 'bkg' | 'gazetteer' | 'wfs' | 'mpapi'
+export type SearchType = 'bkg' | 'gazetteer' | 'wfs' | 'mpapi' | string
 
 /**
  * Additional queryParameters for the GET-Request;