diff --git a/README.md b/README.md
index f877756..403e00f 100644
--- a/README.md
+++ b/README.md
@@ -8,7 +8,7 @@ It can convert comics to different formats to fit your various devices.
 
 ### Features
 
-* reads CBR (RAR), CBZ (ZIP), CB7 (7Z), CBT (TAR), PDF, EPUB, MOBI and plain directory
+* reads CBR (RAR), CBZ (ZIP), CB7 (7Z), CBT (TAR), PDF, XPS, EPUB, MOBI and plain directory
 * saves processed comics in ZIP archive format or TAR
 * images can be converted to JPEG, PNG, TIFF, WEBP, AVIF, or 4-Bit BMP (16 colors) file format
 * rotate, adjust brightness/contrast, adjust levels (Photoshop-like) or grayscale images
diff --git a/cbconvert.go b/cbconvert.go
index 82b8daf..1baebc7 100644
--- a/cbconvert.go
+++ b/cbconvert.go
@@ -1397,7 +1397,7 @@ func (c *Convertor) isArchive(f string) bool {
 
 // isDocument checks if file is document.
 func (c *Convertor) isDocument(f string) bool {
-	var types = []string{".pdf", ".epub", ".mobi"}
+	var types = []string{".pdf", ".xps", ".epub", ".mobi"}
 	for _, t := range types {
 		if strings.ToLower(filepath.Ext(f)) == t {
 			return true