diff --git a/pykl---Technical.md b/klayout-Python-Module--Technical.md
similarity index 96%
rename from pykl---Technical.md
rename to klayout-Python-Module--Technical.md
index 5f2b8c4..e4cda3a 100644
--- a/pykl---Technical.md
+++ b/klayout-Python-Module--Technical.md
@@ -24,11 +24,12 @@ The Qt binding is based on the GSI framework and supplies class descriptors for
 
 ## Module structure
 
-The KLayout master module is "pykl". The KLayout core itself comes in three modules
+The KLayout master module is "klayout". The KLayout core itself comes in four modules
 
 * **tl**: the basic toolbox (boxed types, introspection, utilities, expression parser ...)
 * **db**: the core algorithms of KLayout (geometrical primitives, layout, cells, regions ...)
 * **lay**: the application objects (user interface objects ...)
+* **rdb**: the report database objects
 
 With Qt bindings enabled, some Qt modules add to this: