diff --git a/README.md b/README.md
index c29b4944..55c033c1 100644
--- a/README.md
+++ b/README.md
@@ -864,8 +864,9 @@ interface INPAttribution {
   /**
    * The best-guess timestamp of the next paint after the interaction.
    * In general, this timestamp is the same as the `startTime + duration` of
-   * the event timing entry. However, due to this being rounded to 8ms it
-   * can be slightly after that.
+   * the event timing entry. However, since duration values are rounded to the
+   * nearest 8ms (and can be rounded down), this value is clamped to always be
+   * reported after the processing times.
    */
   nextPaintTime: DOMHighResTimeStamp;
   /**
diff --git a/src/types/inp.ts b/src/types/inp.ts
index d7d826f9..59b2acc5 100644
--- a/src/types/inp.ts
+++ b/src/types/inp.ts
@@ -53,8 +53,9 @@ export interface INPAttribution {
   /**
    * The best-guess timestamp of the next paint after the interaction.
    * In general, this timestamp is the same as the `startTime + duration` of
-   * the event timing entry. However, due to this being rounded to 8ms it
-   * can be slightly after that.
+   * the event timing entry. However, since duration values are rounded to the
+   * nearest 8ms (and can be rounded down), this value is clamped to always be
+   * reported after the processing times.
    */
   nextPaintTime: DOMHighResTimeStamp;
   /**