diff --git a/DESCRIPTION b/DESCRIPTION
index b788dc3..9922bde 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -38,6 +38,7 @@ Imports:
     psych,
     multcomp,
     qgraph,
-    MuMIn
+    MuMIn,
+    webshot
 Remotes: 
     rstudio/rmarkdown
diff --git a/lec14-datasets.Rmd b/lec14-datasets.Rmd
index 504a51a..43932cc 100644
--- a/lec14-datasets.Rmd
+++ b/lec14-datasets.Rmd
@@ -1,6 +1,7 @@
 ---
 title: "Scientific method, team dynamics, and project datasets"
 author: "Luke Johnston"
+output: pdf_document
 ---
 
 ## Lesson preamble:
@@ -24,6 +25,12 @@ author: "Luke Johnston"
 
 -----
 
+```{r message=FALSE, warning=FALSE, include=FALSE}
+# install.packages("webshot")
+webshot::install_phantomjs()
+```
+
+
 ## Scientific method
 
 <!-- What is the scientific method? -->