comment about the test
git-svn-id: svn://svn.valgrind.org/valgrind/trunk@5181 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/memcheck/tests/stack_changes.c b/memcheck/tests/stack_changes.c
index 2bba588..7694b46 100644
--- a/memcheck/tests/stack_changes.c
+++ b/memcheck/tests/stack_changes.c
@@ -7,6 +7,9 @@
#define STACK_SIZE 4096
+// This test is checking the libc context calls (setcontext, etc.) and
+// checks that Valgrind notices their stack changes properly.
+
struct ucontext ctx1, ctx2, oldc;
int count;