diff --git a/Test-problems.md b/Test-problems.md
index bd00247..e61c61c 100644
--- a/Test-problems.md
+++ b/Test-problems.md
@@ -103,7 +103,7 @@ You can also set up and solve the problem by hand. A good way to do this is to f
 
 #### Source
 
-A version of the [Frugal Firepower](#frugal-firepower-optimizing) problem that doesn't require hierarchical constraints.
+A version of the ["Frugal firepower"](#frugal-firepower-optimizing) problem that doesn't require hierarchical constraints.
 
 #### Statement