diff --git a/src/viewer/mod.rs b/src/viewer/mod.rs
new file mode 100644
index 0000000..a562b5b
--- /dev/null
+++ b/src/viewer/mod.rs
@@ -0,0 +1,6 @@
+//! 檢視器模組
+
+pub mod image;
+pub mod markdown;
+pub mod pdf;
+pub mod html;