diff --git a/electronics/pcbfabrication.md b/electronics/pcbfabrication.md
index dba7d2b..67141b3 100644
--- a/electronics/pcbfabrication.md
+++ b/electronics/pcbfabrication.md
@@ -8,5 +8,5 @@ ___
 1. [Applying and exposing the photoresist dry film](electronics/pcbfabrication/applyphotoresist)
 1. [Etching the board](electronics/pcbfabrication/etching)
 1. [Removing the photoresist film](electronics/pcbfabrication/removephotoresist)
-1. [Applying and exposing a solder mask (optional)](electronics/pcbfabrication/soldermask)
-1. [Drilling through-hole components using a CNC machine](electronics/pcbfabrication/drilling)
\ No newline at end of file
+1. [Applying and exposing a solder mask](electronics/pcbfabrication/soldermask) (optional)
+1. [Drilling through-hole components using a CNC machine](electronics/pcbfabrication/drilling) (optional)
\ No newline at end of file