diff --git a/doc/source/admin/advanced-configuration-guide.rst b/doc/source/admin/advanced-configuration-guide.rst
index d794e8cbaa..41779adde6 100644
--- a/doc/source/admin/advanced-configuration-guide.rst
+++ b/doc/source/admin/advanced-configuration-guide.rst
@@ -24,7 +24,7 @@ destination, they will be substituted at runtime.  Other keywords that
 can be used are: ``{tenant_id}``, ``{network_id}`` and ``{router_id}``.
 
 Additionally, if ``proxy_command_use_internal_ip`` is set to ``True``,
-then the internal IP will be subsituted for ``{host}`` in the command.
+then the internal IP will be substituted for ``{host}`` in the command.
 Otherwise (if ``False``, by default) the management IP will be used: this
 corresponds to floating IP if present in the relevant node group, else the
 internal IP. The option is ignored if ``proxy_command`` is not also set.