diff --git a/samples/notebooks/EmittersIntro.jl b/samples/notebooks/EmittersIntro.jl
index 204a67b17..b550cb717 100644
--- a/samples/notebooks/EmittersIntro.jl
+++ b/samples/notebooks/EmittersIntro.jl
@@ -137,7 +137,7 @@ begin
 	local O = Origins.RectGrid(1.0, 1.0, 3, 3)
 	local D = Directions.HexapolarCone(deg2rad(5.0), 3)	
 	
-	# construct the srouce. in this example a "pixel" source will contain only one source as we are simulating a "b/w" display. 
+	# construct the source. in this example a "pixel" source will contain only one source as we are simulating a "b/w" display. 
 	# for RGB displays we can combine 3 sources to simulate "a pixel".
 	local Tr = Transform(Geometry.Vec3(0.5, 0.5, 0.0))
 	local source1 = Sources.Source(Tr, S, O, D, P)