diff --git a/3-99 Research/LEAN/Tutorial World.md b/3-99 Research/LEAN/Tutorial World.md
index 943fdc7e3..74fc0e930 100644
--- a/3-99 Research/LEAN/Tutorial World.md	
+++ b/3-99 Research/LEAN/Tutorial World.md	
@@ -5,3 +5,4 @@
 | `rw [h]`    | $Y = X+a$    | 'Rewrite' an equation using an assumption 'h' or similar.     |
 | `succ x`    | $Y = Y+1$    | 'Successor' says that some number is bigger than another one. |
 | `\l`        | $\leftarrow$ | Does the opposite of rw. Turns Ys into Xs                     |
+| `repeat`    | n/a          | Repeats the following action                                  |