diff --git a/DESCRIPTION b/DESCRIPTION
index b99430bd4..8299b5bd5 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -47,4 +47,4 @@ Config/testthat/parallel: true
 Encoding: UTF-8
 Language: en-GB
 Roxygen: list(markdown = TRUE)
-RoxygenNote: 7.2.3
+RoxygenNote: 7.3.2
diff --git a/NAMESPACE b/NAMESPACE
index 85dd9fe84..8d02a50b0 100644
--- a/NAMESPACE
+++ b/NAMESPACE
@@ -122,6 +122,7 @@ S3method(cnd_header,vctrs_error_subscript_type)
 S3method(diff,vctrs_vctr)
 S3method(duplicated,vctrs_sclr)
 S3method(duplicated,vctrs_vctr)
+S3method(format,hidden)
 S3method(format,vctrs_bytes)
 S3method(format,vctrs_group_rle)
 S3method(format,vctrs_list_of)
diff --git a/R/type-vctr.R b/R/type-vctr.R
index 9770bb9d4..57c964355 100644
--- a/R/type-vctr.R
+++ b/R/type-vctr.R
@@ -750,6 +750,8 @@ new_hidden <- function(x = double()) {
   stopifnot(is.numeric(x))
   new_vctr(vec_cast(x, double()), class = "hidden", inherit_base_type = FALSE)
 }
+
+#' @export
 format.hidden <- function(x, ...) rep("xxx", length(x))
 
 local_hidden <- function(frame = caller_env()) {
diff --git a/man/howto-faq-coercion-data-frame.Rd b/man/howto-faq-coercion-data-frame.Rd
index 9e94c7d33..bea380699 100644
--- a/man/howto-faq-coercion-data-frame.Rd
+++ b/man/howto-faq-coercion-data-frame.Rd
@@ -153,10 +153,11 @@ With these methods vctrs is now able to combine data tables with data
 frames:
 
 \if{html}{\out{<div class="sourceCode r">}}\preformatted{vec_cbind(data.frame(x = 1:3), data.table(y = "foo"))
-#>    x   y
-#> 1: 1 foo
-#> 2: 2 foo
-#> 3: 3 foo
+#>        x      y
+#>    <int> <char>
+#> 1:     1    foo
+#> 2:     2    foo
+#> 3:     3    foo
 }\if{html}{\out{</div>}}
 }