diff --git a/cont.c b/cont.c
index b7ef391581..6760cb3504 100644
--- a/cont.c
+++ b/cont.c
@@ -1102,8 +1102,9 @@ rb_cont_call(int argc, VALUE *argv, VALUE contval)
  *  the programmer and not the VM.
  *
  *  As opposed to other stackless light weight concurrency models, each fiber
- *  comes with a small 4KB stack. This enables the fiber to be paused from deeply
- *  nested function calls within the fiber block.
+ *  comes with a stack.  This enables the fiber to be paused from deeply
+ *  nested function calls within the fiber block.  See the ruby(1)
+ *  manpage to configure the size of the fiber stack(s).
  *
  *  When a fiber is created it will not run automatically. Rather it must
  *  be explicitly asked to run using the <code>Fiber#resume</code> method.