diff --git a/metric_learn/rca.py b/metric_learn/rca.py
index 7f9b7273..0d9b3620 100644
--- a/metric_learn/rca.py
+++ b/metric_learn/rca.py
@@ -97,7 +97,7 @@ def fit(self, data, chunks):
 
     Parameters
     ----------
-    X : (n x d) data matrix
+    data : (n x d) data matrix
         Each row corresponds to a single instance
     chunks : (n,) array of ints
         When ``chunks[i] == -1``, point i doesn't belong to any chunklet.