diff --git a/examples/shapes/collision area/main.go b/examples/shapes/collision_area/main.go
similarity index 100%
rename from examples/shapes/collision area/main.go
rename to examples/shapes/collision_area/main.go
diff --git a/examples/shapes/rectangle scaling/main.go b/examples/shapes/rectangle_scaling/main.go
similarity index 100%
rename from examples/shapes/rectangle scaling/main.go
rename to examples/shapes/rectangle_scaling/main.go