Document that setting will be rounded to one of the settings options.

src/config/browse-by-config.interface.ts

@@ -25,6 +25,8 @@ export interface BrowseByConfig extends Config {
 
   /**
    * Number of entries in the viewport of a paginated browse-by list.
+   * Rounded to the nearest size in the list of selectable sizes on the settings
+   * menu.  See pageSizeOptions in 'pagination-component-options.model.ts'.
    */
    pageSize: number;
 }

src/config/default-app-config.ts

@@ -207,6 +207,8 @@ export class DefaultAppConfig implements AppConfig {
     // The absolute lowest year to display in the dropdown (only used when no lowest date can be found for all items)
     defaultLowerLimit: 1900,
     // The number of entries in a paginated browse results list.
+    // Rounded to the nearest size in the list of selectable sizes on the
+    // settings menu.  See pageSizeOptions in 'pagination-component-options.model.ts'.
     pageSize: 20
   };
 

src/environments/environment.test.ts

@@ -200,6 +200,8 @@ export const environment: BuildConfig = {
     // The absolute lowest year to display in the dropdown (only used when no lowest date can be found for all items)
     defaultLowerLimit: 1900,
     // The number of entries in a paginated browse results list.
+    // Rounded to the nearest size in the list of selectable sizes on the
+    // settings menu.  See pageSizeOptions in 'pagination-component-options.model.ts'.
     pageSize: 20,
   },
   item: {