diff --git a/npm/examples/extract.tcl b/npm/examples/extract.tcl
index 925cca8c..1ae72204 100644
--- a/npm/examples/extract.tcl
+++ b/npm/examples/extract.tcl
@@ -12,14 +12,25 @@
 tech load __TECH__
 load /work/__CELL__
 
-# Write all intermediate files to /work/ so ext2spice can find __CELL__.res.ext
-extract do resistance
+# Write all intermediate files to /work/
 extract path /work
+
+# Enable resistance extraction
+extract do resistance
+
+# Generate __CELL__.ext
 extract all
 
-# extresist requires a valid box cursor; span the full layout to be safe
+# extresist requires a valid selection/box
 select top cell
+
+# Generate __CELL__.res.ext
+extresist all
+
+# SPICE generation settings
 ext2spice format ngspice
 ext2spice extresist on
 ext2spice cthresh 0
-ext2spice /work/__CELL__
+
+# Generate __CELL__.spice
+ext2spice /work/__CELL__
\ No newline at end of file