diff --git a/RELEASE_NOTES.rst b/RELEASE_NOTES.rst
index 1260384e..f69395fd 100644
--- a/RELEASE_NOTES.rst
+++ b/RELEASE_NOTES.rst
@@ -1,6 +1,11 @@
 Release notes
 =============
 
+0.21.1
+------
+
+* ``jsoncheck``: have formatted JSON files end with a newline (lp:bug 1403159)
+
 0.21
 ----
 
diff --git a/os_doc_tools/jsoncheck.py b/os_doc_tools/jsoncheck.py
index de78610a..755052c1 100644
--- a/os_doc_tools/jsoncheck.py
+++ b/os_doc_tools/jsoncheck.py
@@ -107,7 +107,7 @@ def _parse_json(raw):
 def _format_parsed_json(parsed):
     """Pretty-print JSON file content while retaining key order."""
     return json.dumps(parsed, sort_keys=False, separators=(',', ': '),
-                      indent=4)
+                      indent=4) + "\n"
 
 
 def _process_file(path, formatting=None, verbose=False):