diff --git a/prjconfig.sh b/prjconfig.sh
index 67cf8dfac7bf38471c841e2dfe338761459ae593..0049924c61ac8bb69607635761fef4e44df08989 100755
--- a/prjconfig.sh
+++ b/prjconfig.sh
@@ -39,6 +39,20 @@ PRJ_DESCRIPTION="Coast scripts"
 # overwrite this one ONLY if the WD_PATH variable points to the wrong place
 #WD_PATH=config
 
+# The flag WD_USE_MMAP_STREAMS controls the usage of memory mapped files. Default is to use mmap streams
+#  because for most operations and conditions this seems to be fast.
+# When setting this variable to 0, fstreams will be used instead
+# note: Memory mapped files will always increase the file size by an internally managed blocksize,
+#  on SunOS_5.8, this blocksize seems to be 8192 bytes. If you intend to use a tail -f on these files
+#  you will probably not get what you expect. tail can not handle the reserved - and still unused - space.
+#export WD_USE_MMAP_STREAMS=0
+
+# The flag TRACE_STORAGE defines the logging level of memory statistics
+#  0: No pool statistic tracing, except when excess memory was used
+#  1: Trace overall statistics
+#  2: Trace detailed statistics
+#export TRACE_STORAGE=0
+
 # use this function to do preparations prior to creating the distribution package
 # e.g. increment a build number
 #function preDoallFunc {}