diff --git a/.Rbuildignore b/.Rbuildignore
index a443e29..46219e4 100644
--- a/.Rbuildignore
+++ b/.Rbuildignore
@@ -3,7 +3,7 @@ Rakefile
 README.rst
 ^README.html$
 ^codecov.yml$
-cran-comments.rst
+cran-comments.md
 .travis.yml
 ^\.appveyor\.yml$
 ^revdep$
diff --git a/NEWS.md b/NEWS.md
index b491b76..6994a85 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -5,7 +5,7 @@ argparse 2.1.6
 
   They are now less verbose when `interactive()` is `FALSE` (#40).
 
-  There may still a trailing "Execution halted" line output by R's default error handler
+  There may still be a trailing "Execution halted" line output by R's default error handler
   (when `interactive()` is `FALSE`).
   This can be silenced by setting a new error handler near the top of your Rscript e.g.
 
diff --git a/cran-comments.rst b/cran-comments.md
similarity index 100%
rename from cran-comments.rst
rename to cran-comments.md