diff --git a/ewmh.c b/ewmh.c
index 429b96ee4..8a1dfcf1c 100644
--- a/ewmh.c
+++ b/ewmh.c
@@ -462,7 +462,8 @@ ewmh_process_client_message(xcb_client_message_event_t *ev)
         {
             lua_State *L = globalconf_get_lua_State();
             luaA_object_push(L, globalconf.tags.tab[idx]);
-            luaA_object_emit_signal(L, -1, "request::select", 0);
+            lua_pushstring(L, "ewmh");
+            luaA_object_emit_signal(L, -1, "request::select", 1);
             lua_pop(L, 1);
         }
     }
diff --git a/objects/tag.c b/objects/tag.c
index e0dbc6ff1..0bc37c706 100644
--- a/objects/tag.c
+++ b/objects/tag.c
@@ -203,8 +203,9 @@
 #include "ewmh.h"
 #include "luaa.h"
 
-/**
+/** When a tag requests to be selected.
  * @signal request::select
+ * @tparam string context The reason why it was called.
  */
 
 /**