diff --git a/doc/development/open-questions/index.mdwn b/doc/development/open-questions/index.mdwn
index 2a724615a..470162124 100644
--- a/doc/development/open-questions/index.mdwn
+++ b/doc/development/open-questions/index.mdwn
@@ -119,6 +119,9 @@ Discussion of metacognitive strategies that could have computer aides.
everywhere). It is important to know where it occurs to avoid
parochialism.
+ Temporal
+- Sourcing
+ * Primary source, secondary source, etc.
+ + Summaries are not the same as the primary source.
- Thinking routines
*
*