diff --git a/02-spatial-data.Rmd b/02-spatial-data.Rmd
index 6368d5bb6..d3246dfb1 100644
--- a/02-spatial-data.Rmd
+++ b/02-spatial-data.Rmd
@@ -28,7 +28,7 @@ Mac and Linux operating systems (OSs) have additional systems requirements, whic
 See also OS-specific instructions such as that provided by the website [rtask.thinkr.fr](https://rtask.thinkr.fr/installation-of-r-4-2-on-ubuntu-22-04-lts-and-tips-for-spatial-packages/), which covers installing R on the open source OS Ubuntu.
 ```
 
-After you have got a good setup, it's time to run some code!
+After you have got a good set-up, it's time to run some code!
 Unless you already have these packages installed, the first thing to do is to install foundational R packages used in this chapter, with the following commands:^[
 **spDataLarge** is not on CRAN\index{CRAN}, meaning it must be installed via *r-universe* or with the following command: `remotes::install_github("Nowosad/spDataLarge")`.
 ]
@@ -44,7 +44,7 @@ install.packages("spDataLarge", repos = "https://nowosad.r-universe.dev")
 remotes::install_github("r-tmap/tmap")
 ```
 
-The packages needed to reproduce Part 1 of this book can be installed with the following command: `remotes::install_github("geocompx/geocompkg")`.
+The packages needed to reproduce Part I of this book can be installed with the following command: `remotes::install_github("geocompx/geocompkg")`.
 This command uses the function `install_packages()` from the **remotes** package to install source code hosted on the GitHub code hosting, version and collaboration platform.
 The following command will install **all** dependencies required to reproduce the entire book (warning: this may take several minutes): `remotes::install_github("geocompx/geocompkg", dependencies = TRUE)`.
 
diff --git a/README.Rmd b/README.Rmd
index d25249b30..07c43eb37 100644
--- a/README.Rmd
+++ b/README.Rmd
@@ -140,7 +140,7 @@ install.packages("remotes")
 install.packages('geocompkg', repos = c('https://geocompr.r-universe.dev', 'https://cloud.r-project.org'), dependencies = TRUE, force = TRUE)
 ```
 
-Installing `geocompkg` will also install core packages required for reproducing **Part 1 of the book** (chapters 1 to 8). 
+Installing `geocompkg` will also install core packages required for reproducing **Part I of the book** (chapters 1 to 8). 
 Note: you may also need to install [system dependencies](https://github.com/r-spatial/sf#installing) if you're running Linux (recommended) or Mac operating systems.
 You also need to have the [**remotes**](https://github.com/r-lib/remotes/) package installed:
 
diff --git a/README.md b/README.md
index e65bbd804..2b1abaf5f 100644
--- a/README.md
+++ b/README.md
@@ -234,7 +234,7 @@ install.packages('geocompkg', repos = c('https://geocompr.r-universe.dev', 'http
 ```
 
 Installing `geocompkg` will also install core packages required for
-reproducing **Part 1 of the book** (chapters 1 to 8). Note: you may also
+reproducing **Part I of the book** (chapters 1 to 8). Note: you may also
 need to install [system
 dependencies](https://github.com/r-spatial/sf#installing) if you’re
 running Linux (recommended) or Mac operating systems. You also need to