diff --git a/specification/appendices/signing_json.rst b/specification/appendices/signing_json.rst
index 795d6669..8036950e 100644
--- a/specification/appendices/signing_json.rst
+++ b/specification/appendices/signing_json.rst
@@ -59,7 +59,7 @@ Grammar
 +++++++
 
 Adapted from the grammar in http://tools.ietf.org/html/rfc7159 removing
-insignificant whitespace, fractions, exponents and redundant character escapes
+insignificant whitespace, fractions, exponents and redundant character escapes.
 
 .. code::