diff --git a/README.Rmd b/README.Rmd
index 79aee5f..9fc4319 100644
--- a/README.Rmd
+++ b/README.Rmd
@@ -38,6 +38,21 @@ Install the development version from [GitHub](https://github.com/) with:
 remotes::install_github("itsleeds/slopes")
 ```
 
+If you do not already have DEM data and want to make use of the package's ability to download them using the `ceramic` package, install the package with suggested dependencies as follows:
+
+```{r, eval=FALSE}
+# install.packages("remotes")
+remotes::install_github("itsleeds/slopes", dependencies = "Suggests")
+```
+
+Furthermore, you will need to add a MapBox API key to be able to get DEM datasets, by signing up and registering for a key at https://account.mapbox.com/access-tokens/ and then following these steps:
+
+```{r, eval=FALSE}
+usethis::edit_r_environ()
+# Type in (register on the mapbox website):
+MAPBOX_API_KEY=xxxxx
+```
+
 ## Usage
 
 Load the package in the usual way:
diff --git a/README.md b/README.md
index a5a47c5..bdc41f9 100644
--- a/README.md
+++ b/README.md
@@ -30,6 +30,26 @@ Install the development version from [GitHub](https://github.com/) with:
 remotes::install_github("itsleeds/slopes")
 ```
 
+If you do not already have DEM data and want to make use of the
+package’s ability to download them using the `ceramic` package, install
+the package with suggested dependencies as follows:
+
+``` r
+# install.packages("remotes")
+remotes::install_github("itsleeds/slopes", dependencies = "Suggests")
+```
+
+Furthermore, you will need to add a MapBox API key to be able to get DEM
+datasets, by signing up and registering for a key at
+<https://account.mapbox.com/access-tokens/> and then following these
+steps:
+
+``` r
+usethis::edit_r_environ()
+# Type in (register on the mapbox website):
+MAPBOX_API_KEY=xxxxx
+```
+
 ## Usage
 
 Load the package in the usual way:
@@ -149,4 +169,4 @@ lisbon_route_3d_auto = slope_3d(lisbon_route)
 plot_slope(lisbon_route_3d_auto)
 ```
 
-<img src="man/figures/README-unnamed-chunk-10-1.png" width="100%" />
+<img src="man/figures/README-unnamed-chunk-12-1.png" width="100%" />
diff --git a/man/figures/README-dem-lisbon-1.png b/man/figures/README-dem-lisbon-1.png
index d0d9be1..5e343bc 100644
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diff --git a/man/figures/README-plot_slope-1.png b/man/figures/README-plot_slope-1.png
index 2bd7381..d4aca5d 100644
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diff --git a/man/figures/README-route-1.png b/man/figures/README-route-1.png
index 0e06c9a..316f210 100644
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diff --git a/man/figures/README-slope-vis-1.png b/man/figures/README-slope-vis-1.png
index e3c041c..ac4f788 100644
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