diff --git a/docs/workshop/09_md.md b/docs/workshop/09_md.md
index a64defd..2ef58fb 100644
--- a/docs/workshop/09_md.md
+++ b/docs/workshop/09_md.md
@@ -40,8 +40,8 @@ As a simple example, we will explore the system discussed in the lecture -- the
 	Hint: try something like this:
 
 	```
-	grep ' N 1' N2.castep | awk '{print $4,$5,$6}' > N2.r1
-	grep ' N 2' N2.castep | awk '{print $4,$5,$6}' > N2.r2
+	grep ' N          1 ' N2.castep | awk '{print $4,$5,$6}' > N2.r1
+	grep ' N          2 ' N2.castep | awk '{print $4,$5,$6}' > N2.r2
 	paste N2.r1 N2.r2 | awk '{print c++,10.0*sqrt(($4-$11)^2+($5-$12)^2+($6-$13)^2)}' > N2.r12
 	```