diff --git a/doc/concepts/simul_efun b/doc/concepts/simul_efun
index 8c4a2a0..d42c957 100644
--- a/doc/concepts/simul_efun
+++ b/doc/concepts/simul_efun
@@ -8,7 +8,7 @@
         object (except the master object). To get access to efuns that
         are overloaded by the simul_efun object, you can use the
         efun::function() to bypass the simul_efun (unless the
-        simul_efun object has defined the function as ``nomask'').
+        simul_efun object has defined the function as "nomask").
 
 SEE ALSO
         get_simul_efun(M), inheritance(LPC), operators(LPC)