diff --git a/books/projectmycelium/SUMMARY.md b/books/projectmycelium/SUMMARY.md
index 1647b6b..cbc03a0 100644
--- a/books/projectmycelium/SUMMARY.md
+++ b/books/projectmycelium/SUMMARY.md
@@ -13,10 +13,10 @@
   - [Decentralized Cloud](bestkeptsecret/tfgrid_intro.md)
     - [ThreeFold Cloud Intro](bestkeptsecret/tf_architecture.md)
     - [ThreeFold Links](bestkeptsecret/references.md)
-  - [Hero Layer](projectmycelium/hero_layer.md.md)
-  - [Mycelium Layer](projectmycelium/mycelium_layer.md.md)
-  - [Transactional Layer](projectmycelium/transactional__layer.md.md)
-  - [Digital Freezone Layer](projectmycelium/digital_freezone_layer.md.md)
+  - [Hero Layer](projectmycelium/hero_layer.md)
+  - [Mycelium Layer](projectmycelium/mycelium_layer.md)
+  - [Transactional Layer](projectmycelium/transactional_layer.md)
+  - [Digital Freezone Layer](projectmycelium/digital_freezone_layer.md)
 - [Appendix Internet and Cloud](projectmycelium/appendix.md)
   - [ThreeFold Cloud in Nutshell](tfgrid3/who_are_we.md)
   - [Background: What is Internet](bestkeptsecret/concept.md)