diff --git a/docs/PRIMARY_PROTOCOL.md b/docs/PRIMARY_PROTOCOL.md
index 713e4d96750b2645bba805e1da719ab8d0c0a20c..6e58aa41b0c9fc211c33d531acafa2e883aa0a7b 100644
--- a/docs/PRIMARY_PROTOCOL.md
+++ b/docs/PRIMARY_PROTOCOL.md
@@ -160,7 +160,7 @@ properties available to normal web content.
 ### 4.2 JavaScript Shim
 
 To support browsers without native BrowserID support, the provisioning
-content should include the a javascript shim, hosted at:
+content should include a javascript shim, hosted at:
 
     https://browserid.org/provisioning_api.js