diff --git a/spec/ndx-binned-spikes.extensions.yaml b/spec/ndx-binned-spikes.extensions.yaml
index a237245..4a4f094 100644
--- a/spec/ndx-binned-spikes.extensions.yaml
+++ b/spec/ndx-binned-spikes.extensions.yaml
@@ -50,7 +50,7 @@ groups:
     - number_of_events
     shape:
     - null
-    doc: The index of the condition that each timestamps corresponds to (e.g. a stimuli
+    doc: The index of the condition that each timestamps corresponds to (e.g. a stimulus
       type, trial number, category, etc.).This is only used when the data is aligned
       to multiple conditions
     quantity: '?'