diff --git a/problems.md b/problems.md
index 5a1d33493..400503a24 100644
--- a/problems.md
+++ b/problems.md
@@ -1,6 +1,7 @@
 # Problems
 
 - See also: [[problem]].
+- Things that need [[solutions]].
 
 
 [//begin]: # "Autogenerated link references for markdown compatibility"
diff --git a/solutions.md b/solutions.md
index ec224b72f..fd7136fab 100644
--- a/solutions.md
+++ b/solutions.md
@@ -7,5 +7,8 @@
 
 [//begin]: # "Autogenerated link references for markdown compatibility"
 [agora]: agora "Agora"
+[problems]: problems "Problems"
 [solutions]: solutions "Solutions"
+[knowledge]: knowledge "Knowledge"
+[world]: world "World"
 [//end]: # "Autogenerated link references"
\ No newline at end of file