diff --git a/elements/neuron/presynapse.md b/elements/neuron/presynapse.md
index 81134a5..cce1f6c 100644
--- a/elements/neuron/presynapse.md
+++ b/elements/neuron/presynapse.md
@@ -12,6 +12,7 @@ Intro:
   - is expanded and developed by: [AXON](axon.md)
   - is tuned by: ORGANISM, organs, modules
   - expands and tunes: [PRE_VGG](pre_vgcc.md)
+  - develops [_Ca2](), [_Rrp]()
 
 ```Gen
 PRESYNAPSE