diff --git a/ngclearn/components/synapses/hebbian/STDPSynapse.py b/ngclearn/components/synapses/hebbian/STDPSynapse.py
index af07d8180..6a67277fa 100755
--- a/ngclearn/components/synapses/hebbian/STDPSynapse.py
+++ b/ngclearn/components/synapses/hebbian/STDPSynapse.py
@@ -185,7 +185,8 @@ def help(cls): ## component help function
             "A_minus": "Strength of long-term depression (LTD)",
             "tau_plus": "Time constant for long-term potentiation (LTP)",
             "tau_minus": "Time constant for long-term depression (LTD)",
-            "eta": "Global learning rate initial condition"
+            "eta": "Global learning rate initial condition",
+            "tau_w": "Time constant for synaptic adjustment (if Euler-style change used)"
         }
         info = {cls.__name__: properties,
                 "compartments": compartment_props,