diff --git a/types/postcss-less/index.d.ts b/types/postcss-less/index.d.ts
index c5e9210f2f37fb..0a866793d57c58 100644
--- a/types/postcss-less/index.d.ts
+++ b/types/postcss-less/index.d.ts
@@ -3,6 +3,7 @@
 // Definitions by: Masafumi Koba <https://github.com/ybiquitous>
 //                 Daniel Cassidy <https://github.com/djcsdy>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// Minimum TypeScript Version: 3.7
 
 import * as postcss from 'postcss';