diff --git a/doc/man/knot.conf.5in b/doc/man/knot.conf.5in
index b57dad4a70f0c0fab095e9ef231336619f7a2f21..a37f6e49cbe3ce89bf67e1ce2d97098316e954ca 100644
--- a/doc/man/knot.conf.5in
+++ b/doc/man/knot.conf.5in
@@ -651,7 +651,7 @@ can be appended to the address using \fB@\fP separator.
 \fIDefault:\fP not set
 .SS key
 .sp
-A \fI\%reference\fP to the TSIG key which ise used to authenticate
+A \fI\%reference\fP to the TSIG key which is used to authenticate
 the communication with the remote server.
 .sp
 \fIDefault:\fP not set
diff --git a/doc/reference.rst b/doc/reference.rst
index d72324dee506bc978d29cc154132869d962463c1..e90b69765512feb45a4efc08bab2b75130d78631 100644
--- a/doc/reference.rst
+++ b/doc/reference.rst
@@ -775,7 +775,7 @@ can be appended to the address using ``@`` separator.
 key
 ---
 
-A :ref:`reference<key_id>` to the TSIG key which ise used to autenticate
+A :ref:`reference<key_id>` to the TSIG key which is used to authenticate
 the communication with the remote server.
 
 *Default:* not set