diff --git a/vignettes/v00_teaching_hydrology.rmd b/vignettes/v00_teaching_hydrology.rmd
index d44d6979517d5b966049a5400845542813040eb1..bd0ff756298d278db199b432a07423782d916b92 100644
--- a/vignettes/v00_teaching_hydrology.rmd
+++ b/vignettes/v00_teaching_hydrology.rmd
@@ -7,13 +7,13 @@ bibliography:
 output:
   rmarkdown::html_vignette:
 vignette: >
-%\VignetteEngine{knitr::rmarkdown}
+  %\VignetteEngine{knitr::rmarkdown}
   %\VignetteIndexEntry{Ex. 0. Teaching hydrology with airGRteaching}
   %\VignetteEncoding{UTF-8}
-  ---
+---
   
   
-  ```{r, warning=FALSE, include=FALSE}
+```{r, warning=FALSE, include=FALSE}
 R_bib <- toBibtex(citation())
 R_bib <- gsub("@Manual\\{", "@Manual{Rsoftware_man", R_bib)
 airGR_bib <- toBibtex(citation("airGR"))