diff --git a/Variables.md b/Variables.md
index 283c5ca..990a3e9 100644
--- a/Variables.md
+++ b/Variables.md
@@ -8,5 +8,6 @@ The following variables are provided by the library:
 |s.MX|float|Mouse/Touch X|
 |s.MY|float|Mouse/Touch Y|
 |s.T|float|Seconds elapsed since start|
+|s.DT|float|Delta time (Time between frames)|
 
 They can be used anywhere in the code, however you need to run s.start() first
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