diff --git a/.Rbuildignore b/.Rbuildignore
index 1092241..b99bd18 100644
--- a/.Rbuildignore
+++ b/.Rbuildignore
@@ -16,3 +16,4 @@ R-autofun/
 README.Rmd
 ^packrat/
 ^\.Rprofile$
+^CRAN-RELEASE$
diff --git a/CRAN-RELEASE b/CRAN-RELEASE
new file mode 100644
index 0000000..77804b6
--- /dev/null
+++ b/CRAN-RELEASE
@@ -0,0 +1,2 @@
+This package was submitted to CRAN on 2019-04-29.
+Once it is accepted, delete this file and tag the release (commit 475e8e7f38).