diff --git a/docs/lib-cylinder_spiral.md b/docs/lib-cylinder_spiral.md
index 1c8dacf9..3517673a 100644
--- a/docs/lib-cylinder_spiral.md
+++ b/docs/lib-cylinder_spiral.md
@@ -7,8 +7,8 @@ Get all points on the path of a spiral around a cylinder. Its `$fa`, `$fs` and `
 - `radius` : The radius of the cylinder.
 - `levels` : The level count is performed every 360 degrees. 
 - `level_dist` : The distance between two vertial points.
-- `vt_dir` : `"CT_CLK"` for counterclockwise. `"CLK"` for clockwise. The default value is `"CT_CLK"`.
-- `rt_dir` : `"SPI_DOWN"` for spiraling down. `"SPI_UP"` for spiraling up. The default value is `"SPI_DOWN"`.
+- `vt_dir` : `"SPI_DOWN"` for spiraling down. `"SPI_UP"` for spiraling up. The default value is `"SPI_DOWN"`.
+- `rt_dir` : `"CT_CLK"` for counterclockwise. `"CLK"` for clockwise. The default value is `"CT_CLK"`.
 - `$fa`, `$fs`, `$fn` : Check [the cylinder module](https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Primitive_Solids#cylinder) for more details.