diff --git a/src/validation.js b/src/validation.js
index 2834b7e..afb7d70 100644
--- a/src/validation.js
+++ b/src/validation.js
@@ -378,7 +378,8 @@ const validation = {
   // WINDOWS
   /**
    * Ensures the Windows file path is valid and exists.
-   * Resolves any environment variables to absolute paths.
+   * Resolves any environment variables to absolute paths
+   * during validation (original input path is not mutated).
    * If no valid filePath is presented, deleted "windows" object.
    *
    * @example