Some more minor tweaks

Author: cornehoskam

17/umbraco-engage/developers/headless/using-the-marketing-api.md

@@ -62,7 +62,7 @@ To track a page view, send a POST request to:
 * `/umbraco/engage/api/v1/analytics/pageview/trackpageview/client`
 
   * Required: `url` property of the page that a user has visited in the site
-  * Optional: `reffererUrl` can be set to inform Umbraco Engage where the user came from.
+  * Optional: `referrerUrl` can be set to inform Umbraco Engage where the user came from.
 
 * `/umbraco/engage/api/v1/analytics/pageview/trackpageview/server`
 

17/umbraco-engage/developers/personalization/implement-your-own-segment-parameters.md

@@ -31,11 +31,13 @@ A segment rule is not much more than this:
 
 You will have to implement the following interfaces for a new custom parameter:
 
--   `Umbraco.Engage.Infrastructure.Personalization.Segments.ISegmentRule`
+-   `Umbraco.Engage.Infrastructure.Personalization.Segments.Rules.ISegmentRule`
     -   You can extend the existing `BaseSegmentRule` to simplify the implementation.
     -   The most important part to implement is the `bool IsSatisfied(IPersonalizationProfile context)` method.
--   `Umbraco.Engage.Infrastructure.Personalization.Segments.Rules.ISegmentRuleFactory` \* Register your implementation of the segment rule factory with `Lifetime.Transient` in a composer.
-    For the "Day of week" example, the code looks like this:
+-   `Umbraco.Engage.Infrastructure.Personalization.Segments.Rules.ISegmentRuleFactory`
+    -   Register your implementation of the segment rule factory with `Lifetime.Transient` in a composer.
+
+For the "Day of week" example, the code looks like this:
 
 ```c#
 public class DayOfWeekSegmentRule : BaseSegmentRule

17/umbraco-engage/getting-started/for-developers/system-requirements.md

@@ -49,3 +49,12 @@ If you want to run an Umbraco Cloud site locally, point the connection string to
 {% endhint %}
 
 Umbraco Deploy is currently not supported for the Umbraco Engage features.
+
+## Frontend Development Requirements
+
+If you are developing custom extensions for Umbraco Engage (such as custom segment parameters or external profile data components), the following additional requirements apply:
+
+* **Node.js 22+**
+* **npm 10.9+**
+
+These are only required for developers building custom frontend components, not for standard Umbraco Engage usage.