diff --git a/source/memory.tex b/source/memory.tex
index 3a005667b7..bf6caf3404 100644
--- a/source/memory.tex
+++ b/source/memory.tex
@@ -3284,7 +3284,7 @@
 
 \pnum
 In the constructor definitions below,
-enables \tcode{shared_from_this} with \tcode{p},
+\defnx{Enables \tcode{shared_from_this}}{enables \tcode{shared_from_this} with \tcode{p}},
 for a pointer \tcode{p} of type \tcode{Y*},
 means that if \tcode{Y} has an unambiguous and accessible base class
 that is a specialization of \tcode{enable_shared_from_this}\iref{util.smartptr.enab},