-now starts off each thread with only one or two pages of stack, and
-expands it dynamically as needed. Guile will throw an exception for
-stack overflows at some user-defined limit. See the manual for
-documentation on the GUILE_STACK_SIZE environment variable.
+now starts off each thread with only one page of stack, and expands and
+shrinks it dynamically as needed. Guile will throw an exception for
+stack overflows if growing the stack fails. It is also possible to
+impose a stack limit during the extent of a function call. See "Stack
+Overflow" in the manual, for more.