diff --git a/pages/Configuring/Window-Rules.md b/pages/Configuring/Window-Rules.md
index 5697daa..0d7c633 100644
--- a/pages/Configuring/Window-Rules.md
+++ b/pages/Configuring/Window-Rules.md
@@ -109,6 +109,7 @@ Static rules are evaluated once when the window is opened and never again.
 | tile | tiles a window |
 | fullscreen | fullscreens a window |
 | maximize | maximizes a window |
+| fullscreenstate \[internal\] \[client\] | sets the focused window's fullscreen mode and the one sent to the client, where internal and client can be `0` - none, `1` - maximize, `2` - fullscreen, `3` - maximize and fullscreen |
 | move \[x\] \[y\] | moves a floating window (x,y -> int or %, e.g. 20% or 100. You are also allowed to do `100%-` for the right/bottom anchor, e.g. `100%-20`. In addition, the option supports the subtraction of the window size with `100%-w-`, e.g. `100%-w-20`. This results in a gap at the right/bottom edge of the screen to the window with the defined subtracted size). Additionally, you can also do `cursor [x] [y]` where x and y are either pixels or percent. Percent is calculated from the window's size. Specify `onscreen` before other parameters to force the window into the screen (e.g. `move onscreen cursor 50% 50%`) |
 | size \[x\] \[y\] | resizes a floating window (x,y -> int or %, e.g. 20% or 100) |
 | center (\[opt\]) | if the window is floating, will center it on the monitor. Set opt as 1 to respect monitor reserved area |