diff --git a/Doc/api/concrete.tex b/Doc/api/concrete.tex
index 34221ad..764c6aa 100644
--- a/Doc/api/concrete.tex
+++ b/Doc/api/concrete.tex
@@ -602,15 +602,15 @@
 \end{cfuncdesc}
 
 \begin{cfuncdesc}{PyObject*}{PyString_FromString}{const char *v}
-  Return a new string object with the value \var{v} on success, and
-  \NULL{} on failure.  The parameter \var{v} must not be \NULL{}; it
-  will not be checked.
+  Return a new string object with a copy of the string \var{v} as value
+  on success, and \NULL{} on failure.  The parameter \var{v} must not be
+  \NULL{}; it will not be checked.
 \end{cfuncdesc}
 
 \begin{cfuncdesc}{PyObject*}{PyString_FromStringAndSize}{const char *v,
                                                          Py_ssize_t len}
-  Return a new string object with the value \var{v} and length
-  \var{len} on success, and \NULL{} on failure.  If \var{v} is
+  Return a new string object with a copy of the string \var{v} as value
+  and length \var{len} on success, and \NULL{} on failure.  If \var{v} is
   \NULL{}, the contents of the string are uninitialized.
 \end{cfuncdesc}