diff --git a/.Rbuildignore b/.Rbuildignore
index 8351ed3..3a14ccc 100644
--- a/.Rbuildignore
+++ b/.Rbuildignore
@@ -15,3 +15,4 @@
 ^\.travis\.yml$
 ^\_travis\.bak$
 ^cran-comments\.md$
+^CRAN-RELEASE$
diff --git a/CRAN-RELEASE b/CRAN-RELEASE
new file mode 100644
index 0000000..f54f292
--- /dev/null
+++ b/CRAN-RELEASE
@@ -0,0 +1,2 @@
+This package was submitted to CRAN on 2020-05-09.
+Once it is accepted, delete this file and tag the release (commit 5551a9831e).