diff --git a/Cone_spanners_2/examples/Cone_spanners_2/README b/Cone_spanners_2/examples/Cone_spanners_2/README
index d9315668bb7..c6ca7cf8b64 100644
--- a/Cone_spanners_2/examples/Cone_spanners_2/README
+++ b/Cone_spanners_2/examples/Cone_spanners_2/README
@@ -1,4 +1,15 @@
-In the example cpp files, the function std::to_string() is used. Because this function is
+[Examples description]
+compute_cones.cpp: this example computes the cone boundaries given the number of cones
+   and the initial direction. 
+
+theta_io.cpp: this example constructs a Theta graph exactly with an input file containing a vertex list,
+   and then generates the Gnuplot files for plotting the constructed Theta graph.
+
+dijkstra_theta.cpp: this example constructs Theta graph first and then calculates 
+   the shortest paths on this graph by calling the Dijkstra's algorithm from BGL.
+
+[Compilation]
+In the examples, the function std::to_string() is used. Because this function is
 available since c++0x, please turn on '-std=gnu++0x' or '-std=c++0x' to compile. A recommended way 
 is to add the following codes into your 'CMakeLists.txt' file.