[ng] cosmetics: improve a comment

* lib/am/parallel-tests.am (am.test-suite.test-bases): About this variable.

Signed-off-by: Stefano Lattarini <stefano.lattarini@gmail.com>

diff --git a/lib/am/parallel-tests.am b/lib/am/parallel-tests.am
index e2ca4d3ad9ef5641923f8d1c83d07c1a52f8d81e..ac62fbcd379bbefc76b6862423e438b14c7658cb 100644 (file)
--- a/lib/am/parallel-tests.am
+++ b/lib/am/parallel-tests.am
@@ -277,7 +277,9 @@ END { \
 # Restructured Text title.
 am.test-suite.rst-title = { sed 's/.*/   &   /;h;s/./=/g;p;x;s/ *$$//;p;g' && echo; }
 
-# This supports runtime overriding of $(TESTS) and $(XFAIL_TESTS).
+# These support runtime overriding of $(TESTS) and $(XFAIL_TESTS).
+# The first one must be left overridable (hence the definition with '?=',
+# because the 'recheck' target need to override  it (and in a tricky way).
 !am.test-suite.test-bases ?= \
 !  $(call am.memoize,am.test-suite.test-bases,$(call am.test-suite.get-test-bases,$(TESTS)))
 am.test-suite.xfail-test-bases = \