diff --git a/src/wlr-layer-shell-unstable-v1.xml b/src/wlr-layer-shell-unstable-v1.xml
index 75cfb15..ba4bb61 100644
--- a/src/wlr-layer-shell-unstable-v1.xml
+++ b/src/wlr-layer-shell-unstable-v1.xml
@@ -367,6 +367,7 @@
       <entry name="invalid_size" value="1" summary="size is invalid"/>
       <entry name="invalid_anchor" value="2" summary="anchor bitfield is invalid"/>
       <entry name="invalid_keyboard_interactivity" value="3" summary="keyboard interactivity is invalid"/>
+      <entry name="invalid_exclusive_edge" value="4" summary="exclusive edge is invalid given the surface anchors"/>
     </enum>
 
     <enum name="anchor" bitfield="true">
@@ -391,13 +392,14 @@
 
     <request name="set_exclusive_edge" since="5">
       <description summary="set the edge the exclusive zone will be applied to">
-        Requests an edge for the exclusive zone to apply.
-        The edge must be one the surface is anchored to, otherwise a protocol
-        error will be raised.
-        The exclusive edge will be automatically deduced from anchor points
-        when possible, but when when the surface is anchored to a corner,
-        it will be necessary to set it explicitly to disambiguate, as is not
-        possible to deduce which one of the two corner edges should be used.
+        Requests an edge for the exclusive zone to apply. The exclusive
+        edge will be automatically deduced from anchor points when possible,
+        but when the surface is anchored to a corner, it will be necessary
+        to set it explicitly to disambiguate, as it is not possible to deduce
+        which one of the two corner edges should be used.
+
+        The edge must be one the surface is anchored to, otherwise the
+        invalid_exclusive_edge protocol error will be raised.
       </description>
       <arg name="edge" type="uint"/>
     </request>