From a16c3fcfa91aa335b6f0e8b1f0ee6374d5beca3c Mon Sep 17 00:00:00 2001
From: Malcolm Barrett <malcolmbarrett@gmail.com>
Date: Sun, 4 Oct 2026 12:27:22 -0400
Subject: [PATCH] add R-universe installation instructions

---
 README.md  | 18 ++++++++++++++++--
 README.qmd | 19 ++++++++++++++++---
 2 files changed, 32 insertions(+), 5 deletions(-)

diff --git a/README.md b/README.md
index 481f00d..1d3c6e8 100644
--- a/README.md
+++ b/README.md
@@ -6,6 +6,8 @@
 <!-- badges: start -->
 
 [![R-CMD-check](https://github.com/r-causal/quartets/workflows/R-CMD-check/badge.svg)](https://github.com/r-causal/quartets/actions)
+[![R-universe
+version](https://r-causal.r-universe.dev/quartets/badges/version)](https://r-causal.r-universe.dev/quartets)
 <!-- badges: end -->
 
 **Authors:** [Lucy D’Agostino
@@ -32,10 +34,22 @@ You can install the quartets package from CRAN as follows:
 install.packages("quartets")
 ```
 
-Or the development version of quartets like so:
+You can install the development version of quartets from
+[r-causal.r-universe.dev](https://r-causal.r-universe.dev/) with:
 
 ``` r
-devtools::install_github("r-causal/quartets")
+install.packages(
+  "quartets",
+  repos = c("https://r-causal.r-universe.dev", getOption("repos"))
+)
+```
+
+You can also install the development version of quartets from source
+from [GitHub](https://github.com/r-causal/quartets) with:
+
+``` r
+# install.packages("pak")
+pak::pak("r-causal/quartets")
 ```
 
 ## Anscombe’s Quartet
diff --git a/README.qmd b/README.qmd
index 526516b..95d61e2 100644
--- a/README.qmd
+++ b/README.qmd
@@ -1,5 +1,7 @@
 ---
-format: gfm
+format:
+  gfm:
+    default-image-extension: ""
 ---
 
 <!-- README.md is generated from README.qmd. Please edit that file -->
@@ -17,6 +19,7 @@ knitr::opts_chunk$set(
 
 <!-- badges: start -->
 [![R-CMD-check](https://github.com/r-causal/quartets/workflows/R-CMD-check/badge.svg)](https://github.com/r-causal/quartets/actions)
+[![R-universe version](https://r-causal.r-universe.dev/quartets/badges/version)](https://r-causal.r-universe.dev/quartets)
 <!-- badges: end -->
 
 **Authors:** [Lucy D'Agostino McGowan](https://www.lucymcgowan.com/)<br/>
@@ -39,10 +42,20 @@ You can install the quartets package from CRAN as follows:
 install.packages("quartets")
 ```
 
-Or the development version of quartets like so:
+You can install the development version of quartets from [r-causal.r-universe.dev](https://r-causal.r-universe.dev/) with:
 
 ``` r
-devtools::install_github("r-causal/quartets")
+install.packages(
+  "quartets",
+  repos = c("https://r-causal.r-universe.dev", getOption("repos"))
+)
+```
+
+You can also install the development version of quartets from source from [GitHub](https://github.com/r-causal/quartets) with:
+
+``` r
+# install.packages("pak")
+pak::pak("r-causal/quartets")
 ```
 
 ## Anscombe's Quartet