userguide: document new_float option (like new_window)

diff --git a/docs/userguide b/docs/userguide
index b684a6221008fb5a00f5385a0e8284dd927e169a..5880541c22a8ce462b9b98fd3d662216109ffe29 100644 (file)
--- a/docs/userguide
+++ b/docs/userguide
@@ -481,12 +481,15 @@ workspace_layout tabbed
 === Border style for new windows
 
 This option determines which border style new windows will have. The default is
-"normal".
+"normal". Note that new_float applies only to windows which are starting out as
+floating windows, e.g. dialog windows.
 
 *Syntax*:
 ---------------------------------------------
 new_window <normal|1pixel|none|pixel>
+new_float <normal|1pixel|none|pixel>
 ---------------------------------------------
+
 *Example*:
 ---------------------
 new_window 1pixel