diff --git a/notes.md b/notes.md
index e9b7734..97ecf67 100644
--- a/notes.md
+++ b/notes.md
@@ -384,6 +384,20 @@ Policy *areas*, identified by @ILO2022b:
 
 : Study inclusion and exclusion scoping criteria {#tbl-inclusion-criteria}
 
+## Tagging system
+
+Tagging:
+
+- inequality(ies) analysed: `inequality::`
+- intersectionality: `intersectional`
+- intervention: `intervention::`
+- outcome: `outcome::`
+- review: `review::` (meta, systematic, scoping, narrative, ..)
+- design: `design::` (qualitative, mixed, quasi-experimental, experimental)
+- country: `country::`
+- relevancy: `relevant`, `out::` (could be transformed to `excluded::` in end step)
+- status: `TODO`, `done`, `integrated`
+
 ## Matrix extraction properties
 
 | Publication info | Description                                  |