diff --git a/src/docs/overwrite/coreasynchost.md b/src/docs/overwrite/coreasynchost.md
index 06cacd4..e7d8746 100644
--- a/src/docs/overwrite/coreasynchost.md
+++ b/src/docs/overwrite/coreasynchost.md
@@ -14,7 +14,7 @@ const files = new Map([
 ]);
 const host = new CoreAsyncHost({
   ignoreCase: false,
-  useBuiltinGrammers: false,
+  useBuiltinGrammars: false,
   resolveFile: file => file,
   readFile: file => files.get(file)
 });
diff --git a/src/docs/overwrite/coresynchost.md b/src/docs/overwrite/coresynchost.md
index 073c95b..f552e2e 100644
--- a/src/docs/overwrite/coresynchost.md
+++ b/src/docs/overwrite/coresynchost.md
@@ -13,7 +13,7 @@ const files = new Map([
 ]);
 const host = new CoreSyncHost({
   ignoreCase: false,
-  useBuiltinGrammers: false,
+  useBuiltinGrammars: false,
   resolveFile: file => file,
   readFileSync: file => files.get(file)
 });