diff --git a/src/oas.md b/src/oas.md
index 068859e150..a2cbf17ff9 100644
--- a/src/oas.md
+++ b/src/oas.md
@@ -1944,7 +1944,7 @@ requestBody:
             type: [ string, array ]
             pattern: '^[A-Z][a-z]*$'
             items:
-                pattern: '^[A-Z][a-z]*$'
+              pattern: '^[A-Z][a-z]*$'
 
           # Encoding Object overrides the default `application/json` content type
           # for each item in the array with `application/xml; charset=utf-8`