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diff --git a/README b/README
index f07d4cf..4670fb1 100644
--- a/README
+++ b/README
@@ -26,12 +26,28 @@ system, please send mail to one of the mailing lists:
 
 SYSTEM-SPECIFIC HINTS
 
+for NetBSD:
+  NetBSD 2.0 and above are required because of the lack of needed
+  signal APIs in NetBSD 1.6 and earlier.
+
 for OpenBSD:
-  It's reported for CMU CL (by Darren Bane on the comp.lang.lisp newsgroup,
-  2002-04-22) that OpenBSD 3.0 has stricter ulimit values, and/or enforces
-  them more strictly, than its predecessors, and so CMU CL's initial mmap()
-  won't work unless you increase the limit on the data segment, e.g. with
-    ulimit -S -d 524288
-  before you run CMU CL. The same is probably true of SBCL, but hasn't been
-  tested yet. (As of sbcl-0.7.3, SBCL has only been tested on OpenBSD 2.9
-  and earlier.)
+  OpenBSD 3.0 has stricter ulimit values, and/or enforces them more
+  strictly, than its predecessors. Therefore SBCL's initial mmap()
+  won't work unless you increase the limit on the data segment from
+  the OpenBSD defaults, e.g. with
+    ulimit -S -d 1000000
+  before you run SBCL. Otherwise SBCL fails with a message like
+  "ensure_space: failed to validate xxxxxxx bytes at yyyyy". (SBCL
+  is just allocating this huge address space, not actually using this
+  huge memory at this point. OpenBSD <3.0 had no problem with this,
+  but OpenBSD 3.0 is less hospitable.)
+
+for Darwin:
+  PURIFY (which can be used alone but is also used by the system when
+  saving a new core) uses more stack than the default limit on MacOS
+  X.2.  Therefore, in order to get PURIFY to work reliably, you need
+  to increase the limit, with e.g.
+    limit stack 8192 # for the default shell, tcsh
+    ulimit -s 8192 # for bash
+  before running SBCL.  This is also necessary when building the system
+  from sources, as part of the build process involves saving a new core.