docs: control params

website/src/pages/learn/factories.mdx

@@ -20,6 +20,7 @@ These are the equivalents used by the Mini Notation:
 | `timeCat([3,x],[2,y])`         | `"x@2 y@2"`      |
 | `polymeter([a, b, c], [x, y])` | `"{a b c, x y}"` |
 | `polymeterSteps(2, x, y, z)`   | `"{x y z}%2"`    |
+| `silence`                      | `"~"`            |
 
 ## cat
 
@@ -56,3 +57,7 @@ As a chained function:
 ## polymeterSteps
 
 <JsDoc client:idle name="polymeterSteps" h={0} />
+
+## silence
+
+<JsDoc client:idle name="silence" h={0} />