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-rw-r--r--exwm-manage.el4
1 files changed, 3 insertions, 1 deletions
diff --git a/exwm-manage.el b/exwm-manage.el
index a06768f6dcd8..d657b4d4f5f5 100644
--- a/exwm-manage.el
+++ b/exwm-manage.el
@@ -70,7 +70,9 @@ possible choices:
 
 For each X window managed for the first time, matching criteria (sexps) are
 evaluated sequentially and the first configuration with a non-nil matching
-criterion would be applied."
+criterion would be applied.  Apart from generic forms, one would typically
+want to match against EXWM internal variables such as `exwm-title',
+`exwm-class-name' and `exwm-instance-name'."
   :type '(alist :key-type (sexp :tag "Matching criterion" nil)
                 :value-type
                 (plist :tag "Configurations"