diff --git a/elements/neuron/presynapse.md b/elements/neuron/presynapse.md
index dbae523..60950f1 100644
--- a/elements/neuron/presynapse.md
+++ b/elements/neuron/presynapse.md
@@ -11,7 +11,7 @@ include_toc: true
 - modulation:
   - is expanded and developed by: [AXON](axon.md)
   - is tuned by: ORGANISM, organs, modules
-  - expands and tunes: [PRE_VGG](pre_vgcc)
+  - expands and tunes: [PRE_VGG](pre_vgcc.md)
 
 ```Gen
 PRESYNAPSE