diff --git a/ARCHITECTURE.rst b/architecture.rst
similarity index 100%
rename from ARCHITECTURE.rst
rename to architecture.rst
diff --git a/ENVIRONMENT.rst b/environment.rst
similarity index 100%
rename from ENVIRONMENT.rst
rename to environment.rst
diff --git a/index.rst b/index.rst
index 3d73e18..d3c3de3 100644
--- a/index.rst
+++ b/index.rst
@@ -52,11 +52,11 @@ Documentation
    features
    changelog
    HOWTO
-   ENVIRONMENT
-   PROTOCOL
-   PEER_DISCOVERY
+   environment
+   protocol
+   peer_discovery
    rpc-interface
-   ARCHITECTURE
+   architecture
    authors
 
 Indices and tables
diff --git a/PEER_DISCOVERY.rst b/peer_discovery.rst
similarity index 100%
rename from PEER_DISCOVERY.rst
rename to peer_discovery.rst
diff --git a/PROTOCOL.rst b/protocol.rst
similarity index 100%
rename from PROTOCOL.rst
rename to protocol.rst