diff --git a/README.md b/README.md
index 51f7cfe..49f99bc 100644
--- a/README.md
+++ b/README.md
@@ -208,6 +208,9 @@ plugin {
       trigger_height = <int> # default: 0
      
       # a space or comma separated list of workspace ids where autotile should be enabled
+      # it's possible to create an exception rule by prefixing the definition with "not:"
+      # workspaces = 1,2 # autotiling will only be enabled on workspaces 1 and 2
+      # workspaces = not:1,2 # autotiling will be enabled on all workspaces except 1 and 2
       workspaces = <string> # default: all
      
       # if enabled only workspaces that are not in the list are autotiled