diff --git a/platformio/package/exception.py b/platformio/package/exception.py
index 550a3628..11555291 100644
--- a/platformio/package/exception.py
+++ b/platformio/package/exception.py
@@ -41,5 +41,5 @@ class ManifestValidationError(ManifestException):
     def __str__(self):
         return (
             "Invalid manifest fields: %s. \nPlease check specification -> "
-            "htts://docs.platformio.org/page/librarymanager/config.html" % self.messages
+            "https://docs.platformio.org/page/librarymanager/config.html" % self.messages
         )