Clarify parallelism requirements.
tree4e6176c68a0ba97a640d47ea4f4869cda039f542
-rw-r--r-- 1233 AUTHORS
-rw-r--r-- 4583 LICENSE
-rw-r--r-- 244 Makefile
drwxr-xr-x - doc
drwxr-xr-x - specs
drwxr-xr-x - src
drwxr-xr-x - tests