diff --git a/backend/app/services/export_service.py b/backend/app/services/export_service.py
index caae82ac..d680b277 100644
--- a/backend/app/services/export_service.py
+++ b/backend/app/services/export_service.py
@@ -160,7 +160,11 @@ def generate_markdown_export(session: Session, options: SessionExport) -> str:
         notes = decision.get("notes", "")
         duration_seconds = _get_step_duration_seconds(decision)
 
-        lines.append(f"### Step {i}: {question}")
+        is_custom = decision.get("node_id", "").startswith("custom-")
+        prefix = "[CUSTOM] " if is_custom else ""
+        lines.append(f"### Step {i}: {prefix}{question}")
+        if is_custom:
+            lines.append("*Custom step added by engineer*")
         if answer:
             lines.append(f"**Answer:** {answer}")
         if notes:
@@ -247,7 +251,9 @@ def generate_text_export(session: Session, options: SessionExport) -> str:
         notes = decision.get("notes", "")
         duration_seconds = _get_step_duration_seconds(decision)
 
-        lines.append(f"\n{i}. {question}")
+        is_custom = decision.get("node_id", "").startswith("custom-")
+        prefix = "[CUSTOM] " if is_custom else ""
+        lines.append(f"\n{i}. {prefix}{question}")
         if answer:
             lines.append(f"   Answer: {answer}")
         if notes:
@@ -339,7 +345,9 @@ def generate_html_export(session: Session, options: SessionExport) -> str:
         duration_seconds = _get_step_duration_seconds(decision)
 
         html_parts.append('<div class="step">')
-        html_parts.append(f'<h3>Step {i}: {question}</h3>')
+        is_custom = decision.get("node_id", "").startswith("custom-")
+        custom_badge = '<span style="background: #7c3aed; color: white; padding: 2px 6px; border-radius: 3px; font-size: 0.75em; margin-right: 6px;">CUSTOM</span>' if is_custom else ''
+        html_parts.append(f'<h3>{custom_badge}Step {i}: {question}</h3>')
         if answer:
             html_parts.append(f'<p class="answer">Answer: {answer}</p>')
         if notes:
@@ -410,7 +418,9 @@ def generate_psa_export(session: Session, options: SessionExport) -> str:
             notes = decision.get("notes", "")
             duration_seconds = _get_step_duration_seconds(decision)
 
-            line = f"{i}. {question}"
+            is_custom = decision.get("node_id", "").startswith("custom-")
+            prefix = "[CUSTOM] " if is_custom else ""
+            line = f"{i}. {prefix}{question}"
             if answer:
                 line += f" -> {answer}"
             if duration_seconds is not None: