diff --git a/dev-docs/publisher-api-reference.md b/dev-docs/publisher-api-reference.md
index a78489d474..24ee427aa0 100644
--- a/dev-docs/publisher-api-reference.md
+++ b/dev-docs/publisher-api-reference.md
@@ -712,7 +712,6 @@ For an example of a banner ad unit, see below.  For more detailed instructions,
 ```javascript
 pbjs.addAdUnits({
     code: slot.code,
-    sizes: slot.size,
     mediaTypes: {
         banner: {
             sizes: [[300, 250], [300, 600]]