diff --git a/Doc/lib/libfuncs.tex b/Doc/lib/libfuncs.tex
index 0b0a831..8914883 100644
--- a/Doc/lib/libfuncs.tex
+++ b/Doc/lib/libfuncs.tex
@@ -55,8 +55,9 @@
 \begin{funcdesc}{apply}{function, args\optional{, keywords}}
 The \var{function} argument must be a callable object (a user-defined or
 built-in function or method, or a class object) and the \var{args}
-argument must be a tuple.  The \var{function} is called with
-\var{args} as argument list; the number of arguments is the the length
+argument must be a sequence (if it is not a tuple, the sequence is
+first converted to a tuple).  The \var{function} is called with
+\var{args} as the argument list; the number of arguments is the the length
 of the tuple.  (This is different from just calling
 \code{\var{func}(\var{args})}, since in that case there is always
 exactly one argument.)