diff --git a/source/concepts.tex b/source/concepts.tex
index 3cbd110a4a..6e22993652 100644
--- a/source/concepts.tex
+++ b/source/concepts.tex
@@ -1223,13 +1223,15 @@
 
 \pnum
 The concepts in \ref{concepts.callable} describe the requirements on
-callable types\iref{func.def} and their arguments.
+function types, callable types\iref{func.def}, and references to such types,
+and on their arguments.
 
 \rSec2[concept.invocable]{Concept \cname{invocable}}
 
 \pnum
-The \libconcept{invocable} concept specifies a relationship between a callable
-type\iref{func.def} \tcode{F} and a set of argument types \tcode{Args...} which
+The \libconcept{invocable} concept specifies a relationship between \tcode{F}
+(where \tcode{F} is a function type, a callable type\iref{func.def}, or a
+reference to such a type) and a set of argument types \tcode{Args...} which
 can be evaluated by the library function \tcode{invoke}\iref{func.invoke}.
 
 \begin{itemdecl}