diff --git a/api/src/opentrons/protocol_api/instrument_context.py b/api/src/opentrons/protocol_api/instrument_context.py
index <HASH>..<HASH> 100644
--- a/api/src/opentrons/protocol_api/instrument_context.py
+++ b/api/src/opentrons/protocol_api/instrument_context.py
@@ -234,8 +234,8 @@ class InstrumentContext(CommandPublisher):
         aspirated into the pipette will be dispensed (this volume is accessible
         through :py:attr:`current_volume`).
 
-        :param volume: The volume of liquid to dispense, in microliters. If not
-                       specified, defaults to :py:attr:`current_volume`.
+        :param volume: The volume of liquid to dispense, in microliters. If 0
+                       or unspecified, defaults to :py:attr:`current_volume`.
         :type volume: int or float
 
         :param location: Where to dispense into. If `location` is a
docs(api): Explain dispense(volume=0) dispenses the entire current volume (#<I>)