diff --git a/R/22-2-colours.R b/R/22-2-colours.R
index 5fcbc30..aacf4ac 100644
--- a/R/22-2-colours.R
+++ b/R/22-2-colours.R
@@ -71,7 +71,7 @@ ggplot() +
   labs(
     title = "World Population Density",
     caption = "<span style='font-family:\"Cabin Condensed SemiBold\"'>Source:</span>
-    GHSL (GHS-POP), Freire et al. (2016). 
+    GHSL (GHS-POP, 2020), Freire et al. (2016). 
     <span style='font-family:\"Cabin Condensed SemiBold\"'>Visualization:</span>
     Ansgar Wolsing",
     size = "Inhabitants (millions)"
diff --git a/plots/22-2-colours.png b/plots/22-2-colours.png
index 6e06bc1..b49df7a 100644
Binary files a/plots/22-2-colours.png and b/plots/22-2-colours.png differ