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-rw-r--r--Doc/lib/libfuncs.tex5
1 files changed, 3 insertions, 2 deletions
diff --git a/Doc/lib/libfuncs.tex b/Doc/lib/libfuncs.tex
index 26bffcca0c..84f56d873a 100644
--- a/Doc/lib/libfuncs.tex
+++ b/Doc/lib/libfuncs.tex
@@ -548,8 +548,9 @@ class C:
\begin{funcdesc}{isinstance}{object, classinfo}
Return true if the \var{object} argument is an instance of the
\var{classinfo} argument, or of a (direct or indirect) subclass
- thereof. Also return true if \var{classinfo} is a type object and
- \var{object} is an object of that type. If \var{object} is not a
+ thereof. Also return true if \var{classinfo} is a type object
+ (new-style class) and \var{object} is an object of that type or of a
+ (direct or indirect) subclass thereof. If \var{object} is not a
class instance or an object of the given type, the function always
returns false. If \var{classinfo} is neither a class object nor a
type object, it may be a tuple of class or type objects, or may