diff --git a/README.md b/README.md
index b9fb503..dba2c23 100644
--- a/README.md
+++ b/README.md
@@ -16,11 +16,11 @@ With this software, you can obtain the following information:
* Pupil ellipse size [pixel] and angle [deg.]
* Glint position(s) [pixel]
-
+[Sample video on youtube](https://www.youtube.com/watch?v=EH6UVQZgvJE) (a preliminary version and will be updated with a newer version soon).
## Prerequisite
-Currently, the software is compatible with Visual Studio 2015. The test was only done on a 64bit Windows 10 machine only.
+Currently, the software is compatible with Visual Studio 2015. The test was done on a 64bit Windows 10 machine only.
Most of external libraries (for vc14, x64) are bundled in `./external`, yet you still need to
install the following two libraries:
@@ -42,7 +42,7 @@ To setup your own Visual Studio project, you need to use [CMake](https://cmake.o
4. Press `Generate` buttons, then choose a right build environment (Visual Studio 14 2015 Win64)
-5. Open `3d_eye_tracker.sln` in the build folder, and compile `main` module
+5. Open `3d_eye_tracker.sln` in the build folder, and compile `main` module (recommend to set it as a startup project)
## How to run