diff --git a/help/PropData.md b/help/PropData.md
index 1619740..5827b25 100644
--- a/help/PropData.md
+++ b/help/PropData.md
@@ -1,4 +1,7 @@
 # *PropData* reference
+See also:
+* <a href="Prop.md" target="_blank">Prop</a> class reference
+* <a href="PropAction.md" target="_blank">PropAction</a> class reference
 
 *PropData* tracks data changes and provides escape room 2.0 propocol `DATA` ready string format.