diff --git a/docs/glossary.md b/docs/glossary.md
index 1b25d14f7..9243a024f 100644
--- a/docs/glossary.md
+++ b/docs/glossary.md
@@ -238,7 +238,7 @@ environment instances.
 The configuration of these environments is specified in
 individual overlays (one per environment) that all
 refer to a common base that holds common configuration.
-One configures the cluser like this:
+One configures the cluster like this:
 
 > ```
 >  kustomize build someapp/overlays/staging |\