diff --git a/.Rbuildignore b/.Rbuildignore
index ad9ddb2..e885349 100644
--- a/.Rbuildignore
+++ b/.Rbuildignore
@@ -1,3 +1,4 @@
+^CRAN-RELEASE$
 ^.*\.Rproj$
 ^\.Rproj\.user$
 ^README\.Rmd$
diff --git a/CRAN-RELEASE b/CRAN-RELEASE
new file mode 100644
index 0000000..9265f08
--- /dev/null
+++ b/CRAN-RELEASE
@@ -0,0 +1,2 @@
+This package was submitted to CRAN on 2019-05-10.
+Once it is accepted, delete this file and tag the release (commit e178400e93).