diff --git a/src/hello.cpp b/src/hello.cpp
index 9bcc105..e0a1dca 100644
--- a/src/hello.cpp
+++ b/src/hello.cpp
@@ -98,6 +98,8 @@ int main()
 
     Triangle triangle(compileShaderProgram());
 
+    glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
+
     // Main loop
     while (!glfwWindowShouldClose(window))
     {