diff --git a/Envelope_2/doc/Envelope_2/Envelope_2.txt b/Envelope_2/doc/Envelope_2/Envelope_2.txt
index 2dce0e35a1f..c20d82d087f 100644
--- a/Envelope_2/doc/Envelope_2/Envelope_2.txt
+++ b/Envelope_2/doc/Envelope_2/Envelope_2.txt
@@ -181,7 +181,7 @@ diagrams.
 \cgalExample{Envelope_2/convex_hull.cpp}
 
 \cgalFigureBegin{env2_figex_circ,ex_circle.gif}
-A set of four circles, as constructed in \ref Envelope_2/ex_envelope_circles.cpp. The lower envelope and the upper envelope are shown using thick dashed lines of different colors respectively.
+A set of four circles, as constructed in \ref Envelope_2/envelope_circles.cpp. The lower envelope and the upper envelope are shown using thick dashed lines of different colors respectively.
 \cgalFigureEnd
 
 \subsection Envelope_2ExampleforEnvelopeofNonLinearCurves Example for Envelope of Non-Linear Curves