diff --git a/docs/ghost-state.tex b/docs/ghost-state.tex
index cdf29ac097628a993f8cc25ae2e07b0eb7361d15..224999e236cf3c8ee5b098be6172263015c387a6 100644
--- a/docs/ghost-state.tex
+++ b/docs/ghost-state.tex
@@ -67,6 +67,12 @@ from timeless propositions even when working under the later modality:
   \infer{\timeless{\prop} \and \prop \proves \later \propB}
   {\later\prop \proves \later\propB}
 \end{mathpar}
+This rule looks different from the above ones, because we still do not have that
+\begin{mathpar}
+  \inferH{later-fake-rule}{\timeless{\prop}}
+  {\later\prop \proves \prop}
+\end{mathpar}
+
 
 The following rules can be derived about except-0:
 \begin{mathpar}