diff --git a/NAMESPACE b/NAMESPACE
index 4626241..b1a27e7 100644
--- a/NAMESPACE
+++ b/NAMESPACE
@@ -98,6 +98,7 @@ importFrom(stats,glm.fit)
 importFrom(stats,lm)
 importFrom(stats,lm.fit)
 importFrom(stats,lm.wfit)
+importFrom(stats,model.extract)
 importFrom(stats,model.frame)
 importFrom(stats,model.matrix)
 importFrom(stats,model.offset)
@@ -112,6 +113,7 @@ importFrom(stats,terms)
 importFrom(stats,update)
 importFrom(stats,vcov)
 importFrom(stats,weighted.mean)
+importFrom(stats,weights)
 importFrom(survival,survfit)
 importFrom(utils,head)
 importFrom(utils,tail)
diff --git a/R/design.R b/R/design.R
index e5351d0..5d03b27 100644
--- a/R/design.R
+++ b/R/design.R
@@ -92,6 +92,11 @@ offsets.design <- function(object, ...) {
 specials <- function(object, ...) UseMethod("specials")
 
 ##' @export
+##' @title Extract model component from [design] object
+##' @param object [design] object
+##' @param which model component (e.g., "offset", "weights", ...)
+##' @aliases specials specials.design offsets offsets.design weights.design
+##' @param ...  Additional arguments to lower level functions
 specials.design <- function(object, which, ...) {
   return(object[[which]])
 }
diff --git a/R/targeted-package.R b/R/targeted-package.R
index d9b74fb..3db3140 100644
--- a/R/targeted-package.R
+++ b/R/targeted-package.R
@@ -15,7 +15,7 @@
 ##'     model.frame model.matrix na.pass nlminb predict
 ##'     dnorm quantile terms weighted.mean runif
 ##'     .getXlevels delete.response model.response gaussian formula
-##'     model.offset reformulate drop.terms
+##'     model.offset reformulate drop.terms weights model.extract
 ##' @importFrom digest sha1
 ##' @importFrom optimx optimx
 ##' @importFrom data.table data.table is.data.table
diff --git a/README.Rmd b/README.Rmd
index 13bc4bb..555ad3d 100644
--- a/README.Rmd
+++ b/README.Rmd
@@ -13,7 +13,8 @@ knitr::opts_chunk$set(
 <!-- badges: start -->
   [![travis](https://travis-ci.com/kkholst/targeted.svg?branch=main)](https://travis-ci.com/kkholst/targeted)
   [![coverage](https://codecov.io/github/kkholst/targeted/coverage.svg?branch=main)](https://app.codecov.io/github/kkholst/targeted?branch=main)
-  [![license](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](https://opensource.org/license/apache-2-0)
+  [![license](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](
+  https://opensource.org/license/apache-2-0)
   [![cran](https://www.r-pkg.org/badges/version-last-release/targeted)](https://cranlogs.r-pkg.org/downloads/total/last-month/targeted)
 <!-- badges: end -->
 
diff --git a/README.md b/README.md
index e76ed2a..afb9892 100644
--- a/README.md
+++ b/README.md
@@ -5,7 +5,7 @@
 
 <!-- badges: start -->
   [![R-CMD-check](https://github.com/kkholst/targeted/workflows/R-CMD-check/badge.svg?branch=master)](https://github.com/kkholst/targeted/actions)    
-  [![coverage](https://app.codecov.io/github/kkholst/targeted/coverage.svg?branch=master)](https://app.codecov.io/github/kkholst/targeted?branch=master)
+  [![coverage](https://app.codecov.io/github/kkholst/targeted/coverage.svg?branch=main)](https://app.codecov.io/github/kkholst/targeted?branch=main)
   [![license](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](https://opensource.org/license/apache-2-0)
   [![cran](https://www.r-pkg.org/badges/version-last-release/targeted)](https://cranlogs.r-pkg.org/downloads/total/last-month/targeted)
 <!-- badges: end -->
diff --git a/man/specials.design.Rd b/man/specials.design.Rd
new file mode 100644
index 0000000..49b2fc6
--- /dev/null
+++ b/man/specials.design.Rd
@@ -0,0 +1,22 @@
+% Generated by roxygen2: do not edit by hand
+% Please edit documentation in R/design.R
+\name{specials.design}
+\alias{specials.design}
+\alias{specials}
+\alias{offsets}
+\alias{offsets.design}
+\alias{weights.design}
+\title{Extract model component from \link{design} object}
+\usage{
+\method{specials}{design}(object, which, ...)
+}
+\arguments{
+\item{object}{\link{design} object}
+
+\item{which}{model component (e.g., "offset", "weights", ...)}
+
+\item{...}{Additional arguments to lower level functions}
+}
+\description{
+Extract model component from \link{design} object
+}