diff --git a/server/src/main/java/access/security/CustomOidcUserService.java b/server/src/main/java/access/security/CustomOidcUserService.java
index 9672d7b8..e4f2c54c 100644
--- a/server/src/main/java/access/security/CustomOidcUserService.java
+++ b/server/src/main/java/access/security/CustomOidcUserService.java
@@ -41,6 +41,7 @@ public OidcUser loadUser(OidcUserRequest userRequest) throws OAuth2Authenticatio
         // Delegate to the default implementation for loading a user
         OidcUser oidcUser = delegate.loadUser(userRequest);
         Map<String, Object> claims = oidcUser.getUserInfo().getClaims();
+        // We need a mutable Map instead of the returned immutable Map
         Map<String, Object> newClaims = new HashMap<>(claims);
 
         String sub = (String) newClaims.get("sub");