diff --git a/pixeldata/src/lib.rs b/pixeldata/src/lib.rs
index fff3bd975..94fa7f2d7 100644
--- a/pixeldata/src/lib.rs
+++ b/pixeldata/src/lib.rs
@@ -1503,7 +1503,8 @@ impl DecodedPixelData<'_> {
     /// ```no_run
     /// # use dicom_object::open_file;
     /// # use dicom_pixeldata::{DecodedPixelData, PixelDecoder};
-    /// fn get_pixeldata_only(path: &str) -> Result<DecodedPixelData<'static>, Box<dyn std::error::Error>> {
+    # type Error = Box<dyn std::error::Error>;
+    /// fn get_pixeldata_only(path: &str) -> Result<DecodedPixelData<'static>, Error> {
     ///     let obj = open_file(path)?;
     ///     let pixeldata = obj.decode_pixel_data()?;
     ///     // can freely return from function