diff --git a/R/cache.R b/R/cache.R
index e08be5a90..1b36c7b12 100644
--- a/R/cache.R
+++ b/R/cache.R
@@ -1,43 +1,13 @@
-#' Check if the R cache is persistent
-#' @keywords internal
-has_persistent_R.cache <- function() {
-  temp_dirs <- path_if_exist(
-    fs::path_norm(fs::path_dir(tempdir())),
-    "/tmp", "/var/tmp"
-  )
-  !fs::path_has_parent(
-    fs::path_norm(R.cache::getCacheRootPath()), # when no cache exists, it create temp cache
-    temp_dirs
-  ) %>%
-    any()
-}
-
 #' Issue a warning if `{R.cache}` uses temporary cache only
 #'
-#' This function is only exported for use in hook scripts, but it's not intended
-#' to be called by the end-user directly.
-#' @param temp_cache_is_enough Whether a temporary cache is accepted or not. `TRUE`
-#'   means no warning will be issued, `FALSE` means a warning will be issued if
-#'   no permanent cache is available.
+#' This function used to check if a permanent cache was available and issue a
+#' warning if not, but since {R.cache} version `0.15.0` (release date
+#' 2021-04-27), a permanent directory will be used automatically, so this check
+#' if redundant. the function is kept in the package for compatibility, i.e.
+#' if someone updates the R package {precommit} but not the hook revisions.
+#' @param temp_cache_is_enough ignored.
 #' @family hook script helpers
 #' @export
 may_require_permanent_cache <- function(temp_cache_is_enough = FALSE) {
-  if (has_persistent_R.cache()) {
-    cat("Using persistent cache at", R.cache::getCacheRootPath(), "\n")
-  } else {
-    if (temp_cache_is_enough) {
-      cat("Using temporary cache at", R.cache::getCacheRootPath(), "\n")
-    } else {
-      cat(paste0(
-        "You don't have a permanent cache directory set up with {R.cache}. ",
-        "This means you won't get significant speedups for some hooks. ",
-        "Create a permanent cache in an interactive R session by \n\n1) calling ",
-        "`R.cache::getCachePath()` and confirm the prompt or \n\n2) ",
-        "non-interactively by setting the environment variable ",
-        "`R_CACHE_ROOTPATH` to the location you want to put the cache. \n\nYou can ",
-        "silent this warning with setting `args: [--no-warn-cache]` in your ",
-        ".pre-commit-config.yaml.\n\n"
-      ))
-    }
-  }
+  return()
 }
diff --git a/man/has_persistent_R.cache.Rd b/man/has_persistent_R.cache.Rd
deleted file mode 100644
index 3c62f1b5b..000000000
--- a/man/has_persistent_R.cache.Rd
+++ /dev/null
@@ -1,12 +0,0 @@
-% Generated by roxygen2: do not edit by hand
-% Please edit documentation in R/cache.R
-\name{has_persistent_R.cache}
-\alias{has_persistent_R.cache}
-\title{Check if the R cache is persistent}
-\usage{
-has_persistent_R.cache()
-}
-\description{
-Check if the R cache is persistent
-}
-\keyword{internal}
diff --git a/man/may_require_permanent_cache.Rd b/man/may_require_permanent_cache.Rd
index 189bb7995..a79aac4c2 100644
--- a/man/may_require_permanent_cache.Rd
+++ b/man/may_require_permanent_cache.Rd
@@ -7,13 +7,14 @@
 may_require_permanent_cache(temp_cache_is_enough = FALSE)
 }
 \arguments{
-\item{temp_cache_is_enough}{Whether a temporary cache is accepted or not. \code{TRUE}
-means no warning will be issued, \code{FALSE} means a warning will be issued if
-no permanent cache is available.}
+\item{temp_cache_is_enough}{ignored.}
 }
 \description{
-This function is only exported for use in hook scripts, but it's not intended
-to be called by the end-user directly.
+This function used to check if a permanent cache was available and issue a
+warning if not, but since {R.cache} version \verb{0.15.0} (release date
+2021-04-27), a permanent directory will be used automatically, so this check
+if redundant. the function is kept in the package for compatibility, i.e.
+if someone updates the R package {precommit} but not the hook revisions.
 }
 \seealso{
 Other hook script helpers: 
diff --git a/tests/testthat/test-cache.R b/tests/testthat/test-cache.R
deleted file mode 100644
index ca0d193bd..000000000
--- a/tests/testthat/test-cache.R
+++ /dev/null
@@ -1,75 +0,0 @@
-test_that("R api works", {
-  withr::with_options(
-    list(R.cache.rootPath = fs::file_temp(".Rcache")),
-    {
-      expect_false(has_persistent_R.cache())
-    }
-  )
-  withr::with_options(
-    list(R.cache.rootPath = fs::file_temp(".Rcache")),
-    {
-      expect_output(may_require_permanent_cache(), "This means you")
-    }
-  )
-
-  withr::with_options(
-    list(R.cache.rootPath = fs::file_temp(".Rcache")),
-    {
-      expect_output(
-        may_require_permanent_cache(temp_cache_is_enough = TRUE),
-        "Using temporary cache at"
-      )
-    }
-  )
-})
-
-test_that("CLI API works for style-files", {
-  skip_if(is_windows(), "env not supported in system2 on Windows")
-  R.cache_root <- fs::path_abs(fs::file_temp("R.cacheTemp"))
-  fs::dir_create(R.cache_root)
-  run_test(
-    "style-files",
-    suffix = "-cache-success.R",
-    env = paste0("R_CACHE_ROOTPATH=", R.cache_root),
-    msg = "You can silent this"
-  )
-  R.cache_root <- fs::path_abs(fs::dir_create("R.cachePerm"))
-  fs::dir_create(R.cache_root)
-  withr::defer(fs::dir_delete(R.cache_root))
-  run_test(
-    "style-files",
-    suffix = "-cache-success.R",
-    env = paste0("R_CACHE_ROOTPATH=", R.cache_root),
-    msg = "Using persistent"
-  )
-})
-
-test_that("CLI API works for roxygenize", {
-  skip_if(is_windows(), "env not supported in system2 on Windows")
-  R.cache_root <- fs::path_abs(fs::file_temp("R.cacheTemp"))
-  fs::dir_create(R.cache_root)
-  run_test(
-    "roxygenize",
-    suffix = "-cache-success.R",
-    env = paste0("R_CACHE_ROOTPATH=", R.cache_root),
-    msg = "You can silent this",
-    artifacts = c("DESCRIPTION" = test_path("in/DESCRIPTION-no-deps.dcf")),
-    file_transformer = function(x) {
-      git_init()
-      x
-    }
-  )
-  R.cache_root <- fs::path_abs(fs::dir_create("R.cachePerm"))
-  fs::dir_create(R.cache_root)
-  withr::defer(fs::dir_delete(R.cache_root))
-  run_test(
-    "roxygenize",
-    suffix = "-cache-success.R",
-    env = paste0("R_CACHE_ROOTPATH=", R.cache_root),
-    msg = "Using persistent",
-    file_transformer = function(x) {
-      git_init()
-      x
-    }
-  )
-})
diff --git a/vignettes/available-hooks.Rmd b/vignettes/available-hooks.Rmd
index 074b0b6c9..e2d6a0594 100644
--- a/vignettes/available-hooks.Rmd
+++ b/vignettes/available-hooks.Rmd
@@ -83,13 +83,7 @@ In addition, the hook takes the following arguments that are not passed to
   args: [--style_pkg=pkg.with.style.guide, --style_fun=exported.style.function]
 ```
 
-* If no permanent `{R.cache}` cache exists, the hook emits a warning which you 
-  can silence with `--no-warn-cache`.
-
-```
-  id: style-files
-  args: [--no-warn-cache]
-```
+* The argument `--no-warn-cache` is ignored but allowed for compatibility.
 
   
 * Argument `cache-root` is passed to `options()` to set `styler.cache_root`.
@@ -177,13 +171,8 @@ should pass.
 
 A hook to run `roxygen2::roxygenize()`. Makes sure you commit your `.Rd` changes
 with the source changes. To take advantage of caching, you don't need to run
-`roxygen2::roxygenize()` manually anymore. If no permanent `{R.cache}` cache 
-exists, the hook emits a warning which you can silence with 
-`--no-warn-cache`.
-```
-  id: royxgenize
-  args: [--no-warn-cache] 
-```
+`roxygen2::roxygenize()` manually anymore. The option `--no-warn-cache` is 
+ignored but allowed for compatibility.
 
 Because the hook will write the version of {roxygen2} to `DESCRIPTON`, you
 should either make sure the version you use when you call {roxygen2}