diff --git a/DESCRIPTION b/DESCRIPTION
index 4d9e5f0..0157d12 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -8,3 +8,4 @@ URL: https://avsdev.uk/R/Rpacman
 Description: Very simple package manager for R which allows scanning for used packages, finding their dependencies and versions, creating a lock file and installing the packages on a new build.
 License: GPL (>= 3)
 Depends: R (>= 3.1.0), dplyr, magrittr, renv
+RoxygenNote: 7.1.1
diff --git a/NAMESPACE b/NAMESPACE
new file mode 100644
index 0000000..6c3c1ff
--- /dev/null
+++ b/NAMESPACE
@@ -0,0 +1,3 @@
+# Generated by roxygen2: do not edit by hand
+
+export(list_depends)
diff --git a/R/list_depends.R b/R/list_depends.R
new file mode 100644
index 0000000..34ecbc6
--- /dev/null
+++ b/R/list_depends.R
@@ -0,0 +1,39 @@
+
+.list_depends <- function(depends, gen) {
+  packages <- installed.packages()
+  packages <- as.data.frame(packages)
+  packages <- packages[packages$Package %in% depends,]
+  packages <- packages[,c("Package", "Version", "Imports")]
+  packages$Imports <- gsub(packages$Imports, pattern = "\n", replacement = " ")
+  packages$Imports <- strsplit(packages$Imports, ", ")
+  packages <- data.frame(
+    package = rep(packages$Package, lengths(packages$Imports)),
+    version = rep(packages$Version, lengths(packages$Imports)),
+    imports = unlist(packages$Imports)
+  )
+  packages$min_version <- gsub(packages$imports, pattern = "[^ ]*( \\([=> ]*([^)]+)\\))?", replacement = "\\2")
+  packages$min_version = ifelse(nchar(packages$min_version) == 0, NA_character_, packages$min_version)
+  packages$imports <- gsub(packages$imports, pattern = " \\([^)]*\\)", replacement = "")
+  packages$generation <- gen
+
+  depends_next <- packages$imports[!is.na(packages$imports)]
+  depends_next <- sort(unique(depends_next))
+  if (length(depends_next) > 0) {
+    packages_next <- list_imports(depends_next, gen + 1)
+    packages <- rbind(packages, packages_next)
+  }
+
+  return(packages)
+}
+
+
+#' Recursively find all the installed dependencies of one or more installed
+#' packages.
+#'
+#' @param depends A character vector of packages to find dependencies of
+#'
+#' @return A data frame with the dependency tree
+#' @export
+list_depends <- function(depends) {
+  .list_depends(depends, gen = 0)
+}
\ No newline at end of file
diff --git a/man/list_depends.Rd b/man/list_depends.Rd
new file mode 100644
index 0000000..103142c
--- /dev/null
+++ b/man/list_depends.Rd
@@ -0,0 +1,17 @@
+% Generated by roxygen2: do not edit by hand
+% Please edit documentation in R/list_depends.R
+\name{list_depends}
+\alias{list_depends}
+\title{Recursively find all the installed dependencies of one or more packages.}
+\usage{
+list_depends(depends)
+}
+\arguments{
+\item{depends}{A character vector of packages to find dependencies of}
+}
+\value{
+A data frame with the dependency tree
+}
+\description{
+Recursively find all the installed dependencies of one or more packages.
+}