diff --git a/doc/dnssec-guide/validation.rst b/doc/dnssec-guide/validation.rst
index a499587983..33958bb2a0 100644
--- a/doc/dnssec-guide/validation.rst
+++ b/doc/dnssec-guide/validation.rst
@@ -706,7 +706,7 @@ database (``managed-keys.bind.jnl``) as the source of key information.
Explicit management of keys was common in the early days of DNSSEC, when
neither the root zone nor many top-level domains were signed. Since
-then, `over 90% `__ of
+then, `over 90% `__ of
the top-level domains have been signed, including all the largest ones.
Unless you have a particular need to manage keys yourself, it is best to
use the BIND defaults and let the software manage the root key.