Minor grammar refinement for hmac.compare_digest().
diff --git a/Modules/operator.c b/Modules/operator.c
index 5adb4de..12fdad5 100644
--- a/Modules/operator.c
+++ b/Modules/operator.c
@@ -217,8 +217,8 @@
"or any type that supports the buffer protocol (e.g. bytes).\n"
"\n"
"Note: If a and b are of different lengths, or if an error occurs,\n"
-"a timing attack may be able to reveal information about the types\n"
-"and lengths of a and b, but not their values.\n");
+"a timing attack could theoretically reveal information about the\n"
+"types and lengths of a and b--but not their values.\n");
static PyObject*
compare_digest(PyObject *self, PyObject *args)