diff --git a/specification/appendices/threepids.rst b/specification/appendices/threepids.rst
index a275143f..cd312710 100644
--- a/specification/appendices/threepids.rst
+++ b/specification/appendices/threepids.rst
@@ -16,9 +16,9 @@
 ----------
 Third Party Identifiers (3PIDs) represent identifiers on other namespaces that
 might be associated with a particular person. They comprise a tuple of ``medium``
-which is a string that identifies the namespace in which the identifier exists
+which is a string that identifies the namespace in which the identifier exists,
 and an ``address``: a string representing the identifier in that namespace. This
-must be a canonical form of the identifier, ie. if multiple strings could
+must be a canonical form of the identifier, *ie.* if multiple strings could
 represent the same identifier, only one of these strings must be used in a 3PID
 address, in a well-defined manner.