diff --git a/Doc/lib/libchunk.tex b/Doc/lib/libchunk.tex
index c580c772683..8e2a4947f4d 100644
--- a/Doc/lib/libchunk.tex
+++ b/Doc/lib/libchunk.tex
@@ -78,7 +78,7 @@ The remaining methods will raise \exception{IOError} if called after
 the \method{close()} method has been called.
 
 \begin{methoddesc}{isatty}{}
-Returns \code{0}.
+Returns \code{False}.
 \end{methoddesc}
 
 \begin{methoddesc}{seek}{pos\optional{, whence}}
diff --git a/Doc/lib/libimp.tex b/Doc/lib/libimp.tex
index 972128f6b68..150f5b42021 100644
--- a/Doc/lib/libimp.tex
+++ b/Doc/lib/libimp.tex
@@ -94,8 +94,8 @@ Return a new empty module object called \var{name}.  This object is
 \end{funcdesc}
 
 \begin{funcdesc}{lock_held}{}
-Return 1 if the import lock is currently held, else 0.
-On platforms without threads, always return 0.
+Return \code{True} if the import lock is currently held, else \code{False}.
+On platforms without threads, always return \code{False}.
 
 On platforms with threads, a thread executing an import holds an internal
 lock until the import is complete.
@@ -174,8 +174,8 @@ module called \var{name}.
 \end{funcdesc}
 
 \begin{funcdesc}{is_frozen}{name}
-Return \code{1} if there is a frozen module (see
-\function{init_frozen()}) called \var{name}, or \code{0} if there is
+Return \code{True} if there is a frozen module (see
+\function{init_frozen()}) called \var{name}, or \code{False} if there is
 no such module.
 \end{funcdesc}
 
diff --git a/Doc/lib/librfc822.tex b/Doc/lib/librfc822.tex
index 2fb7d3e23e4..6451b3e9328 100644
--- a/Doc/lib/librfc822.tex
+++ b/Doc/lib/librfc822.tex
@@ -156,8 +156,8 @@ checks that the line is blank, but you can override it in a subclass.
 \end{methoddesc}
 
 \begin{methoddesc}{iscomment}{line}
-Return true if the given line should be ignored entirely, just skipped.
-By default this is a stub that always returns false, but you can
+Return \code{True} if the given line should be ignored entirely, just skipped.
+By default this is a stub that always returns \code{False}, but you can
 override it in a subclass.
 \end{methoddesc}
 
diff --git a/Doc/lib/libstdtypes.tex b/Doc/lib/libstdtypes.tex
index d63e4d5c843..f42f84e985f 100644
--- a/Doc/lib/libstdtypes.tex
+++ b/Doc/lib/libstdtypes.tex
@@ -1072,8 +1072,8 @@ Files have the following methods:
 \end{methoddesc}
 
 \begin{methoddesc}[file]{isatty}{}
-  Return true if the file is connected to a tty(-like) device, else
-  false.  \note{If a file-like object is not associated
+  Return \code{True} if the file is connected to a tty(-like) device, else
+  \code{False}.  \note{If a file-like object is not associated
   with a real file, this method should \emph{not} be implemented.}
 \end{methoddesc}
 
@@ -1193,7 +1193,7 @@ These are not required for file-like objects, but should be
 implemented if they make sense for the particular object.
 
 \begin{memberdesc}[file]{closed}
-Boolean indicating the current state of the file object.  This is a
+bool indicating the current state of the file object.  This is a
 read-only attribute; the \method{close()} method changes the value.
 It may not be available on all file-like objects.
 \end{memberdesc}
diff --git a/Doc/lib/libthread.tex b/Doc/lib/libthread.tex
index 328e9b713a4..227dd3d4ce1 100644
--- a/Doc/lib/libthread.tex
+++ b/Doc/lib/libthread.tex
@@ -82,8 +82,8 @@ reason for existence), and returns \code{None}.  If the integer
 value: if it is zero, the lock is only acquired if it can be acquired
 immediately without waiting, while if it is nonzero, the lock is
 acquired unconditionally as before.  If an argument is present, the
-return value is \code{1} if the lock is acquired successfully,
-\code{0} if not.
+return value is \code{True} if the lock is acquired successfully,
+\code{False} if not.
 \end{methoddesc}
 
 \begin{methoddesc}[lock]{release}{}
@@ -92,8 +92,8 @@ necessarily by the same thread.
 \end{methoddesc}
 
 \begin{methoddesc}[lock]{locked}{}
-Return the status of the lock:\ \code{1} if it has been acquired by
-some thread, \code{0} if not.
+Return the status of the lock:\ \code{True} if it has been acquired by
+some thread, \code{False} if not.
 \end{methoddesc}
 
 \strong{Caveats:}
diff --git a/Doc/lib/libzipfile.tex b/Doc/lib/libzipfile.tex
index 74dc942b177..a6430cb2d62 100644
--- a/Doc/lib/libzipfile.tex
+++ b/Doc/lib/libzipfile.tex
@@ -48,8 +48,8 @@ The available attributes of this module are:
 \end{classdesc}
 
 \begin{funcdesc}{is_zipfile}{filename}
-  Returns true if \var{filename} is a valid ZIP file based on its magic
-  number, otherwise returns false.  This module does not currently
+  Returns \code{True} if \var{filename} is a valid ZIP file based on its magic
+  number, otherwise returns \code{False}.  This module does not currently
   handle ZIP files which have appended comments.
 \end{funcdesc}