diff --git a/Header.md b/Header.md
index 9b4719a..cf55685 100644
--- a/Header.md
+++ b/Header.md
@@ -6,7 +6,7 @@ classoption:
   - numbered
   - print
   - index
-  - oneside
+  - twoside
 
 toc: true
 toc-depth: 2
diff --git a/SubHeader.md b/SubHeader.md
index 0641600..9b2d7dc 100644
--- a/SubHeader.md
+++ b/SubHeader.md
@@ -6,7 +6,7 @@ classoption:
   - numbered
   - print
   - index
-  - oneside
+  - twoside
 
 toc: true
 toc-depth: 2