diff --git a/README.md b/README.md
index a38a01d..80e02db 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,7 @@
 
 The [TAP Attribute Dictionary](tap-core-person-schema.adoc) defines a dictionary of common
 attributes used across various components of the TAP portfolio. The
-normative specification of the TAP Attribute Dictionary is abstract -- it cannot be used directly, but is
+normative specification of the TAP Attribute Dictionary is abstract -- it cannot be used directly. It is
 best thought of as an *attribute library* that can be used to construct othe documents.
 
 The following types of documents are defined as part of the TAP Attribute Dictionary: