diff --git a/man/man3/thread.3 b/man/man3/thread.3
index 02e4c868..c0a59091 100644
--- a/man/man3/thread.3
+++ b/man/man3/thread.3
@@ -158,27 +158,21 @@ by
 The thread library provides a
 .I main
 function that sets up a proc with a single thread executing
-.I threadmain
-on a stack of size
-.I mainstacksize
-(default eight kilobytes).
-To set
-.IR mainstacksize ,
-declare a global variable
-initialized to the desired value
-.RI ( e.g. ,
-.B int
-.B mainstacksize
-.B =
-.BR 1024 ).
-When using the
+.IR threadmain .
+.PP
+Every thread is backed by an operating system-provided
 .I pthread
-library,
-.B mainstacksize
-is ignored, as is the stack size argument to
-.BR proccreate :
-the first thread in each proc
-runs on the native system stack.
+and runs on its system-provided stack;
+.I mainstacksize
+and the the stack size arguments to
+.I proccreate
+and
+.I threadcreate
+are ignored.
+Although each thread is backed by a separate
+.IR pthread ,
+the threads in a proc are still scheduled non-preemptively
+as on Plan 9 and as described below.
 .PP
 .I Threadcreate
 creates a new thread in the calling proc, returning a unique integer
diff --git a/src/libthread/thread.c b/src/libthread/thread.c
index 94173ebc..0c764000 100644
--- a/src/libthread/thread.c
+++ b/src/libthread/thread.c
@@ -7,7 +7,7 @@ static	uint		threadnsysproc;
 static	Lock		threadnproclock;
 static	Ref		threadidref;
 static	Proc		*threadmainproc;
-static	int		pthreadperthread;
+static	int		pthreadperthread = 1;
 
 static	void		addproc(Proc*);
 static	void		delproc(Proc*);