diff --git a/src/main/java/emu/grasscutter/auth/HandbookAuthenticator.java b/src/main/java/emu/grasscutter/auth/HandbookAuthenticator.java
index 732887770..46d2f473f 100644
--- a/src/main/java/emu/grasscutter/auth/HandbookAuthenticator.java
+++ b/src/main/java/emu/grasscutter/auth/HandbookAuthenticator.java
@@ -11,6 +11,7 @@ public interface HandbookAuthenticator {
     class Response {
         private final int status;
         private final String body;
+        @Builder.Default private boolean html = false;
     }
 
     /**
diff --git a/src/main/java/emu/grasscutter/server/http/documentation/HandbookHandler.java b/src/main/java/emu/grasscutter/server/http/documentation/HandbookHandler.java
index 2f722bd22..61a27cd47 100644
--- a/src/main/java/emu/grasscutter/server/http/documentation/HandbookHandler.java
+++ b/src/main/java/emu/grasscutter/server/http/documentation/HandbookHandler.java
@@ -1,7 +1,5 @@
 package emu.grasscutter.server.http.documentation;
 
-import static emu.grasscutter.config.Configuration.HANDBOOK;
-
 import emu.grasscutter.Grasscutter;
 import emu.grasscutter.auth.AuthenticationSystem.AuthenticationRequest;
 import emu.grasscutter.server.http.Router;
@@ -13,6 +11,8 @@ import io.javalin.Javalin;
 import io.javalin.http.ContentType;
 import io.javalin.http.Context;
 
+import static emu.grasscutter.config.Configuration.HANDBOOK;
+
 /** Handles requests for the new GM Handbook. */
 public final class HandbookHandler implements Router {
     private final byte[] handbook;
@@ -103,7 +103,7 @@ public final class HandbookHandler implements Router {
                 ctx.status(result.getStatus())
                         .result(result.getBody())
                         .contentType(
-                                result.getBody().contains("html") ? ContentType.TEXT_HTML : ContentType.TEXT_PLAIN);
+                                result.isHtml() ? ContentType.TEXT_HTML : ContentType.TEXT_PLAIN);
             }
         }
     }