diff --git a/src/myfasthtml/test/matcher.py b/src/myfasthtml/test/matcher.py
index 1581a19..05536c6 100644
--- a/src/myfasthtml/test/matcher.py
+++ b/src/myfasthtml/test/matcher.py
@@ -72,6 +72,12 @@ class EndsWith(AttrPredicate):
 
 class Contains(AttrPredicate):
   def __init__(self, *value, _word=False):
+    """
+    Initializes the instance with the given value and optional private attribute `_word`.
+
+    :param value:
+    :param _word: Matches the entire word if True, otherwise matches any substring.
+    """
     super().__init__(value)
     self._word = _word
   
diff --git a/tests/controls/test_profiler.py b/tests/controls/test_profiler.py
index d54659f..5db1c50 100644
--- a/tests/controls/test_profiler.py
+++ b/tests/controls/test_profiler.py
@@ -196,7 +196,7 @@ class TestProfilerRender:
     
     trace_list = profiler_control._mk_trace_list()
     
-    cmd_spans = find(trace_list, Span("NavigateCell", cls=Contains("mf-profiler-cmd")))
+    cmd_spans = find(trace_list, Span("NavigateCell", cls=Contains("mf-profiler-cmd", _word=True)))
     assert len(cmd_spans) == 1, "Command name should appear exactly once in the trace list"
     
     ts_spans = find(trace_list, Span(ts_expected, cls=Contains("mf-profiler-ts")))