diff --git a/NAMESPACE b/NAMESPACE
index af79e88..b0315fc 100644
--- a/NAMESPACE
+++ b/NAMESPACE
@@ -29,3 +29,4 @@ importMethodsFrom(ProtGenerics,dataStorage)
 importMethodsFrom(ProtGenerics,intensity)
 importMethodsFrom(ProtGenerics,mz)
 importMethodsFrom(ProtGenerics,peaksData)
+importMethodsFrom(ProtGenerics,scanIndex)
diff --git a/R/MsBackendRawFileReader.R b/R/MsBackendRawFileReader.R
index 2cc4c1b..947f602 100644
--- a/R/MsBackendRawFileReader.R
+++ b/R/MsBackendRawFileReader.R
@@ -198,6 +198,7 @@ setMethod("scanType", "MsBackendRawFileReader",
           })
 
 #' @exportMethod scanIndex
+#' @importMethodsFrom ProtGenerics scanIndex
 #' @rdname MsBackendRawFileReader
 #' @return a character vector of scan index.
 #' @examples