matplotlib
diff --git a/‎examples/lines_bars_and_markers/fill_demo.py
+17-4 b/‎examples/lines_bars_and_markers/fill_demo.py
+17-4
diff --git a/‎examples/lines_bars_and_markers/fill_demo_features.py
-21 b/‎examples/lines_bars_and_markers/fill_demo_features.py
-21
@@ -1,9 +1,15 @@
 """
-==================
-A simple Fill plot
-==================
+==============
+Fill plot demo
+==============
 
-This example showcases the most basic fill plot a user can do with matplotlib.
+First example showcases the most basic fill plot a user can do with matplotlib.
+
+Second example shows a few optional features:
+
+    * Multiple curves with a single command.
+    * Setting the fill color.
+    * Setting the opacity (alpha value).
 """
 import numpy as np
 import matplotlib.pyplot as plt
@@ -15,4 +21,11 @@
 
 ax.fill(x, y, zorder=10)
 ax.grid(True, zorder=5)
+
+x = np.linspace(0, 2 * np.pi, 500)
+y1 = np.sin(x)
+y2 = np.sin(3 * x)
+
+fig, ax = plt.subplots()
+ax.fill(x, y1, 'b', x, y2, 'r', alpha=0.3)
 plt.show()