t/README | 4 ++++

diff --git a/t/README b/t/README
new file mode 100644
index 0000000000000000000000000000000000000000..233c3280e3f1f65122f87a286d9a0a0fa7feb8a62fba881cc2717e892e27f598
--- /dev/null
+++ b/t/README
@@ -0,0 +1,4 @@
+This tests are imported from other redo projects. Read corresponding
+READMEs. They could be run manually, but by default each test is wrapped
+to be run under sharness (https://github.com/chriscool/sharness), that
+is compatible with TAP (https://testanything.org/) protocol.