diff --git a/aeon/transformations/collection/base.py b/aeon/transformations/collection/base.py
index 013001d80e..4596327b0a 100644
--- a/aeon/transformations/collection/base.py
+++ b/aeon/transformations/collection/base.py
@@ -69,6 +69,10 @@ def fit(self, X, y=None):
             ``(n_channels, n_timepoints_i)``, where ``n_timepoints_i`` is length of
             series ``i``. Other types are allowed and converted into one of the above.
 
+            **Note:** While a list of numpy arrays for unequal length series is accepted
+            as input, it cannot be processed and will raise a `ValueError`.
+            Ensure all time series have the same length before using the transformer.
+
             Different estimators have different capabilities to handle different
             types of input. If ``self.get_tag("capability:multivariate")`` is False,
             they cannot handle multivariate series. If ``self.get_tag(
@@ -123,6 +127,10 @@ def transform(self, X, y=None):
             ``(n_channels, n_timepoints_i)``, where ``n_timepoints_i`` is length of
             series ``i``. Other types are allowed and converted into one of the above.
 
+            **Note:** While a list of numpy arrays for unequal length series is accepted
+            as input, it cannot be processed and will raise a `ValueError`.
+            Ensure all time series have the same length before using the transformer.
+
             Different estimators have different capabilities to handle different
             types of input. If ``self.get_tag("capability:multivariate")`` is False,
             they cannot handle multivariate series. If ``self.get_tag(
@@ -177,6 +185,10 @@ def fit_transform(self, X, y=None):
             n_channels, n_timepoints_i)``, where ``n_timepoints_i`` is length of
             series ``i``. Other types are allowed and converted into one of the above.
 
+            **Note:** While a list of numpy arrays for unequal length series is accepted
+            as input, it cannot be processed and will raise a `ValueError`.
+            Ensure all time series have the same length before using the transformer.
+
             Different estimators have different capabilities to handle different
             types of input. If ``self.get_tag("capability:multivariate")`` is False,
             they cannot handle multivariate series. If ``self.get_tag(
@@ -227,6 +239,10 @@ def inverse_transform(self, X, y=None):
             ``(n_channels, n_timepoints_i)``, where ``n_timepoints_i`` is length of
             series ``i``. Other types are allowed and converted into one of the above.
 
+            **Note:** While a list of numpy arrays for unequal length series is accepted
+            as input, it cannot be processed and will raise a `ValueError`.
+            Ensure all time series have the same length before using the transformer.
+
             Different estimators have different capabilities to handle different
             types of input. If ``self.get_tag("capability:multivariate")`` is False,
             they cannot handle multivariate series. If ``self.get_tag(