diff --git a/tests/sentinel-tests/04-slave-selection.tcl b/tests/sentinel-tests/04-slave-selection.tcl
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+++ b/tests/sentinel-tests/04-slave-selection.tcl
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+# Test slave selection algorithm.
+#
+# This unit should test:
+# 1) That when there are no suitable slaves no failover is performed.
+# 2) That among the available slaves, the one with better offset is picked.