diff --git a/external.ts b/external.ts
index 9a4d88a..052b4ee 100644
--- a/external.ts
+++ b/external.ts
@@ -273,6 +273,13 @@ export interface WriteablePayload {
   triggerer?: string | undefined;
   /** event-level instructions for this trigger type (flag-expanded server-side) */
   eventInstructions?: string | undefined;
+  /**
+   * system-injected note about prior superseded runs (e.g. when the
+   * triggering @pullfrog comment is edited). rendered alongside the user's
+   * prompt rather than via eventInstructions so it survives user-prompt
+   * precedence.
+   */
+  previousRunsNote?: string | undefined;
   /** event data from webhook payload - discriminated union based on trigger field */
   event: PayloadEvent;
   /** timeout for agent run (e.g., "10m", "1h30m") - defaults to "1h" */
diff --git a/utils/instructions.ts b/utils/instructions.ts
index 3f14d42..07a48fc 100644
--- a/utils/instructions.ts
+++ b/utils/instructions.ts
@@ -32,6 +32,7 @@ function buildRuntimeContext(ctx: InstructionsContext): string {
     "~pullfrog": _,
     prompt: _p,
     eventInstructions: _ei,
+    previousRunsNote: _prn,
     event: _e,
     ...payloadRest
   } = ctx.payload;
@@ -146,17 +147,23 @@ In case of conflict between instructions, follow this precedence (highest to low
 // section builders
 // ---------------------------------------------------------------------------
 
-// the user's task: blockquoted user prompt, or event-level instructions for auto-triggers
+// the user's task: blockquoted user prompt, or event-level instructions for auto-triggers.
+// `previousRunsNote` is system-injected context (e.g. prior runs superseded by a
+// comment edit); it's appended regardless of which branch wins so it survives
+// user-prompt precedence over eventInstructions.
 function buildTaskSection(ctx: PromptContext): string {
+  const previousRunsNote = ctx.payload.previousRunsNote?.trim() ?? "";
+
   if (ctx.userQuoted) {
+    const parts = [ctx.userQuoted, previousRunsNote].filter(Boolean);
     return `************* YOUR TASK *************
 
-${ctx.userQuoted}`;
+${parts.join("\n\n")}`;
   }
 
   const eventInstructions = ctx.payload.eventInstructions ?? "";
-  if (eventInstructions) {
-    const parts = [ctx.eventTitle, eventInstructions].filter(Boolean);
+  if (eventInstructions || previousRunsNote) {
+    const parts = [ctx.eventTitle, eventInstructions, previousRunsNote].filter(Boolean);
     return `************* YOUR TASK *************
 
 ${parts.join("\n\n")}`;
diff --git a/utils/payload.ts b/utils/payload.ts
index fd526ae..13003a9 100644
--- a/utils/payload.ts
+++ b/utils/payload.ts
@@ -21,6 +21,7 @@ export const JsonPayload = type({
   "triggerer?": "string | undefined",
 
   "eventInstructions?": "string",
+  "previousRunsNote?": "string",
   "event?": "object",
   "timeout?": "string | undefined",
   "progressComment?": type({
@@ -157,6 +158,7 @@ export function resolvePayload(
       // it's not a common use case but GITHUB_ACTOR can be a user when the workflow is manually triggered by a user through GitHub Actions UI
       (!isPullfrog(process.env.GITHUB_ACTOR) ? process.env.GITHUB_ACTOR : undefined),
     eventInstructions: jsonPayload?.eventInstructions,
+    previousRunsNote: jsonPayload?.previousRunsNote,
     event,
     timeout: inputs.timeout ?? jsonPayload?.timeout,
     cwd: resolveCwd(inputs.cwd),