Link to instructions on writing a custom Subject.

#306 (comment) ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=167319077
google · Sep 6, 2017 · 3053515 · 3053515
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@@ -177,8 +177,8 @@ though your test is probably buggy. Under AssertJ, it doesn't compile.
 
 AssertJ supports Hamcrest-style ["conditions."][conditions]
 
-Truth does not. We encourage people to instead write custom `Subject`
-implementations, which IDEs can better surface during autocompletion.
+Truth does not. We encourage people to instead write [custom `Subject`
+implementations](extension), which IDEs can better surface during autocompletion.
 
 ### And more