diff --git a/ezplotly_bio/ezplotly_bio.py b/ezplotly_bio/ezplotly_bio.py
index 2915a27..ac3a3ca 100644
--- a/ezplotly_bio/ezplotly_bio.py
+++ b/ezplotly_bio/ezplotly_bio.py
@@ -579,7 +579,7 @@ def ecdf(
             xlabel=xlabel,
             ylabel=ylabel,
             xlim=[min_bin, max_bin + bin_size],
-            ylim=[0, 1.0],
+            ylim=[0, 1.0 + y_dtick],
             name=name,
             xscale=xscale,
             yscale=yscale,
@@ -684,7 +684,7 @@ def rcdf(
             xlabel=xlabel,
             ylabel=ylabel,
             xlim=[min_bin, max_bin + bin_size],
-            ylim=[0, 1.0],
+            ylim=[-0.1, 1.1],
             name=name,
             xscale=xscale,
             yscale=yscale,