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diff --git a/wiki/Shielding.mdwn b/wiki/Shielding.mdwn
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+See also the [[Open Shielding Project]].
+
+- TODO: split this page into two: background information, and building information
+- TODO: mention making a double-layer entrance (airlock) to allow for tight shielding with airflow
+
 Shielding is material which protects an area from electric or magnetic fields.
 
 Some people shield spaces to prevent advanced hacking.  Others feel weapons or surveillance systems are targeting them.  Others feel something is communicating with their body or brain.
@@ -6,7 +11,7 @@ Please share your shielding projects.  It can inspire others and help us collabo
 
 There are three primary ways in which things can reach or affect your safe space.  One or all of these may be affecting you:
 
-* Electric fields and high-frequency electromagnetic radiation
+== Electric fields and high-frequency electromagnetic radiation
 
     Common forms include light and microwaves.  Most information, nowadays, is sent via high-frequency electromagnetic radiation.  They are blocked by covering an area in continuous conductive material, with no holes or gaps of any sort, not even seams.  Spaces shielded in this way are used industrially to protect sensitive equipment.
 
@@ -22,13 +27,13 @@ There are three primary ways in which things can reach or affect your safe space
 
     Test your room by seeing if your cell phone works in there, or if you can get wifi.  If either of these function, you definitely need to close any small gaps, or make another space or another layer inside the one you just made.
 
-* Magnetic fields and low-frequency electromagnetic radiation
+== Magnetic fields and low-frequency electromagnetic radiation
 
     A common form is AC power.  Shielding from these signals is more difficulty and may involve a magnetic metal such as iron or steel.  Researchers use strong magnetically shielded rooms to study the magnetic fields produced by the human brain, but in general it is more common to use and study the electric fields.
 
     On Jeremy Radlow's old page, he mentioned the approach of mixing iron filings with paint in order to provide shielding which would include some protection against magnetic fields.  I might imagine alternating layers of such paint with strong electric field shielding between them.  Insulation such as normal paint should be placed between the layers, so that the iron filings do not disturb the smooth surface of the electric shielding.
 
-* Physical vibrations
+== Physical vibrations
 
     Common forms are sound, ultrasound, projectiles, earthquakes.  These are blocked as sound would be.  My personal experience is that building layers of electric and magnetic shielding ends up also providing a lot of sound shielding, inadvertently.