diff --git a/book/source/04-certificates.md b/book/source/04-certificates.md
index 05901dc..45e5d77 100644
--- a/book/source/04-certificates.md
+++ b/book/source/04-certificates.md
@@ -149,7 +149,7 @@ For further conventions on User IDs, refer to the document [draft-dkg-openpgp-us
 
 **Split User IDs**
 
-One proposed variant for encoding identities in User IDs is to use ["split User IDs"](https://dkg.fifthhorseman.net/blog/2021-dkg-openpgp-transition.html#split-user-ids). Although currently uncommon, there are currently no significant technical barriers to implementing this format[^dkg-split].
+One proposed variant for encoding identities in User IDs is to use ["split User IDs"](https://dkg.fifthhorseman.net/blog/2021-dkg-openpgp-transition.html#split-user-ids). Although uncommon, there are currently no significant technical barriers to implementing this format[^dkg-split].
 
 [^dkg-split]: Historically, the OpenPGP ecosystem faced challenges in this context. For further details, refer to Daniel Kahn Gillmor's January 2019 article, ["What were Separated User IDs"](https://dkg.fifthhorseman.net/blog/2019-dkg-openpgp-transition.html#what-were-separated-user-ids).