diff --git a/WuV/bolsem.tex b/WuV/bolsem.tex
index e11df03..74b9a4c 100644
--- a/WuV/bolsem.tex
+++ b/WuV/bolsem.tex
@@ -144,6 +144,7 @@ \subsection{Semantics}
   \begin{compactitem}
   \item A binary predicate symbol $C_R\sq i\times i$. Note that $R$ may be a complex expression; so we have to generate a fresh name $C_R$ here.
   \item The axiom $\forall x:\iota,y:\iota.\,R(x,y)\impl C_R(x,y)$, i.e., $C_R$ extends $R$.
+  \item The axiom $\forall x:\iota.\,C_R(x,x)$, i.e., $C_R$ is reflexive.
   \item The axiom $\forall x:\iota,y:\iota,z:\iota.\,C_R(x,y)\wedge C_R(y,z)\impl C_R(x,z)$, i.e., $C_R$ is transitive.
   \end{compactitem}
  \item We add the case $\sem{R^*}=C_R(x,y)$ to the interpretation function.
@@ -625,4 +626,4 @@ \section{Exercise 2}
 You have to implement that as well or use a library for it.
 
 We recommend not focusing on implementing the syntax and semantics in their entirety.
-It is more instructive to save time by choosing a sublanguage of BOL (by omitting some productions) and to use the time to implement a second semantics.
\ No newline at end of file
+It is more instructive to save time by choosing a sublanguage of BOL (by omitting some productions) and to use the time to implement a second semantics.