diff --git a/__main__.py b/__main__.py
index 0206572dbfb19e9a884e1e28f67bedc2956ace40..bd8360a9a899ff32b740647f4a995fd2eac5db89 100755
--- a/__main__.py
+++ b/__main__.py
@@ -95,12 +95,13 @@ TEST_SET.extend(BASIC_TESTS)
 TEST_SET.extend(AVAILABILITY_TESTS)
 TEST_SET.extend(CAUSAL_TESTS)
 TEST_SET.extend(CONVERGENCE_TESTS)
-# ... to here can  be run in parallel. 
+# ... to here can be run in parallel.
 # Below here should be run synchronously:
 TEST_SET.extend(PROXY_TESTS)
 TEST_SET.extend(SHUFFLE_TESTS)
 TEST_SET.extend(STRESS_TESTS)
-# This one is less of a test and more a graphing program:
+# This one is less of a test and more a graphing program
+# (absolutely CANNOT be run in parallel thanks to matplotlib):
 TEST_SET.extend(BENCHMARKS)
 
 # set to True to stop at the first failing test