diff --git a/qiskit/transpiler/passes/utils/unroll_forloops.py b/qiskit/transpiler/passes/utils/unroll_forloops.py
index b4df3609014a..c83a47f72eec 100644
--- a/qiskit/transpiler/passes/utils/unroll_forloops.py
+++ b/qiskit/transpiler/passes/utils/unroll_forloops.py
@@ -19,15 +19,19 @@
 
 
 class UnrollForLoops(TransformationPass):
-    """UnrollForLoops transpilation pass unrolls for-loops when possible."""
+    """``UnrollForLoops`` transpilation pass unrolls for-loops when possible."""
 
     def __init__(self, max_target_depth=-1):
         """Things like `for x in {0, 3, 4} {rx(x) qr[1];}` will turn into
         `rx(0) qr[1]; rx(3) qr[1]; rx(4) qr[1];`.
 
+        .. note::
+            The ``UnrollForLoops`` unrolls only one level of block depth. No inner loop will
+            be considered by ``max_target_depth``.
+
         Args:
-            max_target_depth (int): Optional. Checks if the unrolled block is over a particular depth.
-                To disable the check, use ``-1`` (Default)
+            max_target_depth (int): Optional. Checks if the unrolled block is over a particular
+                subcircuit depth. To disable the check, use ``-1`` (Default).
         """
         super().__init__()
         self.max_target_depth = max_target_depth