diff --git a/Docs/URL_Parameters.md b/Docs/URL_Parameters.md
index 151659b55b..bf0bb4a760 100644
--- a/Docs/URL_Parameters.md
+++ b/Docs/URL_Parameters.md
@@ -68,10 +68,12 @@ Finally, the URL-hash is the part after the `#`. It is `node/1234` in this case.
  The language to display MapComplete in.
 The user display language is determined in the following order:
 - If the user did log in and did set their language before with MapComplete, use this language
-- If the user visited MapComplete before and did change their language, use this language (saved in localStorage)
+- If the user visited MapComplete before and did change their language, use the language as set by this URL-parameter. This will _disable_ saving the language to localStorage in case a non-logged-in user changes their language
 - Use the navigator-language (if available)
 - Use English
 
+Note that this URL-parameter is not added to the URL-bar by default.
+
 Translations are never complete. If a translation in a certain language is missing, English is used as fallback. No default value set
 
 
diff --git a/UI/i18n/Locale.ts b/UI/i18n/Locale.ts
index b569508204..122cb10a05 100644
--- a/UI/i18n/Locale.ts
+++ b/UI/i18n/Locale.ts
@@ -38,6 +38,8 @@ export default class Locale {
                     "- Use the navigator-language (if available)",
                     "- Use English",
                     "",
+                    "Note that this URL-parameter is not added to the URL-bar by default.",
+                    "",
                     "Translations are never complete. If a translation in a certain language is missing, English is used as fallback."].join("\n"),
             )
         } else {