diff --git a/vlsi/example-sky130.yml b/vlsi/example-sky130.yml
index 9fdc1e61..1fa8a1e9 100644
--- a/vlsi/example-sky130.yml
+++ b/vlsi/example-sky130.yml
@@ -6,9 +6,11 @@ vlsi.core.max_threads: 12
 
 # Technology paths
 technology.sky130:
-  sky130A: "/path-to-/sky130A"
-  openram_lib: "/path-to-/sky130_sram_macros" 
-  sky130_nda: "/path-to-/skywater-src-nda"
+  sky130A: "/path/to/sky130A"
+  openram_lib: "/path/to/sky130_sram_macros" 
+
+  # this key is OPTIONAL, no NDA files will be used if it does not point to a valid path
+  sky130_nda: "/path/to/skywater-src-nda"
 
 # General Hammer Inputs