diff --git a/vignettes/lcms_annotation_tutorial.Rmd b/vignettes/lcms_annotation_tutorial.Rmd
index 7a5c4aa..7f4b39a 100644
--- a/vignettes/lcms_annotation_tutorial.Rmd
+++ b/vignettes/lcms_annotation_tutorial.Rmd
@@ -42,6 +42,7 @@ library(CAMERA)
 library(ggplot2)
 library(ggrepel)
 library(scales)
+library(stringr)
 ```
 
 # Pre-processing the data