diff --git a/PORTING.md b/PORTING.md
index d008b539..1b2dbc24 100644
--- a/PORTING.md
+++ b/PORTING.md
@@ -1,7 +1,7 @@
 # Porting to a New Technology
 
 If you want to support a new technology, you will need to create:
-+ a setup script for each technology you want to use
++ a setup script (`<technology>/__init__.py`) for each technology you want to use
 + a technology directory for each technology with the base cells
 
 We provide two technology examples for [SCMOS] and [FreePDK45]. Each
@@ -15,7 +15,7 @@ specific technology (e.g., [FreePDK45]) should be a subdirectory
   * `replica\_cell\_1rw.gds`
   * `dummy\_cell\_1rw.gds`
 * `sp_lib` folder with all the `.sp` (premade) library netlists for the above cells.
-* `layers.map`
+* `layers.map` (for workflows using Calibre verification otherwise inlined into tech.py)
 * A valid tech Python module (tech directory with `__init__.py` and `tech.py`) with:
   * References in tech.py to spice models
   * DRC/LVS rules needed for dynamic cells and routing