diff --git a/Variables.md b/Variables.md
index 990a3e9..553f27f 100644
--- a/Variables.md
+++ b/Variables.md
@@ -9,5 +9,9 @@ The following variables are provided by the library:
 |s.MY|float|Mouse/Touch Y|
 |s.T|float|Seconds elapsed since start|
 |s.DT|float|Delta time (Time between frames)|
+|s.PI|float|Pi|
+|s.TWO_PI|float|2*s.PI|
+|s.HALF_PIfloat|s.PI/2|
+
 
 They can be used anywhere in the code, however you need to run s.start() first
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