diff --git a/src/validation/rules/UniqueDirectivesPerLocation.js b/src/validation/rules/UniqueDirectivesPerLocation.js
index a4eef87bc6..6d7cb59608 100644
--- a/src/validation/rules/UniqueDirectivesPerLocation.js
+++ b/src/validation/rules/UniqueDirectivesPerLocation.js
@@ -27,7 +27,7 @@ export function duplicateDirectiveMessage(directiveName: string): string {
 /**
  * Unique directive names per location
  *
- * A GraphQL document is only valid if all directives at a given location
+ * A GraphQL document is only valid if directives, that are not marked as `isRepeatable`, at a given location
  * are uniquely named.
  */
 export function UniqueDirectivesPerLocation(