diff --git a/510_Deployment/40_config.asciidoc b/510_Deployment/40_config.asciidoc
index 94ea5404b..b079bc5b0 100644
--- a/510_Deployment/40_config.asciidoc
+++ b/510_Deployment/40_config.asciidoc
@@ -3,7 +3,7 @@
 Elasticsearch ships with _very good_ defaults,((("deployment", "configuration changes, important")))((("configuration changes, important"))) especially when it comes to performance-
 related settings and options.  When in doubt, just leave
 the settings alone.  We have witnessed countless dozens of clusters ruined
-by errant settings because the administrator thought he could turn a knob
+by errant settings because the administrator thought they could turn a knob
 and gain 100-fold improvement.
 
 [NOTE]