diff --git a/cython/README.md b/cython/README.md
index a2c749e7..0c9865df 100644
--- a/cython/README.md
+++ b/cython/README.md
@@ -8,7 +8,7 @@ python-solvespace
 
 Python library from solver of SolveSpace.
 
-Feature for CDemo and Python interface can see [here](https://github.com/KmolYuan/python-solvespace/blob/master/Cython/DOC.txt).
+Feature for CDemo and Python interface can see [here](https://github.com/solvespace/solvespace/blob/master/exposed/DOC.txt).
 
 Build and Test
 ===