diff --git a/src/main/java/it/cnr/isti/workflow/manager/executions/executors/blocks/LLMAttachmentPreparer.java b/src/main/java/it/cnr/isti/workflow/manager/executions/executors/blocks/LLMAttachmentPreparer.java
index f062dea..d408c4c 100644
--- a/src/main/java/it/cnr/isti/workflow/manager/executions/executors/blocks/LLMAttachmentPreparer.java
+++ b/src/main/java/it/cnr/isti/workflow/manager/executions/executors/blocks/LLMAttachmentPreparer.java
@@ -167,28 +167,35 @@ public class LLMAttachmentPreparer {
         return null;
     }
 
+    /**
+     * The document's text, said to be exactly that. Headed as an attachment, a model that takes
+     * only text answers that it cannot open files - it reads the heading as a file it was not
+     * given, and never gets to the text right under it.
+     */
     private String documentBlock(String name, ReadPdf read) {
+        String nl = System.lineSeparator();
         StringBuilder block = new StringBuilder();
-        block.append(System.lineSeparator()).append(System.lineSeparator())
-                .append("--- Attached document: ").append(name).append(" (").append(read.pageCount())
-                .append(read.pageCount() == 1 ? " page" : " pages").append(") ---").append(System.lineSeparator());
+        block.append(nl).append(nl)
+                .append("You were given the document ").append(name).append(" (").append(read.pageCount())
+                .append(read.pageCount() == 1 ? " page" : " pages").append("). ");
         if (read.hasText()) {
-            block.append(read.text()).append(System.lineSeparator());
+            block.append("Its full text is included here, between the two markers, so you can read it directly:")
+                    .append(nl).append("<<<BEGIN ").append(name).append(">>>").append(nl)
+                    .append(read.text()).append(nl);
             if (read.textTruncated()) {
-                block.append("[The text is cut here: the document is longer than can be sent.]")
-                        .append(System.lineSeparator());
+                block.append("[The text is cut here: the document is longer than can be sent.]").append(nl);
             }
+            block.append("<<<END ").append(name).append(">>>");
         } else {
-            block.append("[This document has no text layer; read it from its page images.]").append(System.lineSeparator());
+            block.append("It has no text layer, so read it from its page images.");
         }
         if (!read.pageImages().isEmpty()) {
-            block.append("[Its first ").append(read.pageImages().size())
+            block.append(nl).append("Its first ").append(read.pageImages().size())
                     .append(read.pageImages().size() == 1 ? " page is" : " pages are")
                     .append(" also attached as images")
                     .append(read.pageImages().size() < read.pageCount() ? ", of " + read.pageCount() : "")
-                    .append(".]").append(System.lineSeparator());
+                    .append(".");
         }
-        block.append("--- End of ").append(name).append(" ---");
         return block.toString();
     }
 
diff --git a/src/test/java/it/cnr/isti/workflow/manager/executions/executors/blocks/LLMAttachmentPreparerTest.java b/src/test/java/it/cnr/isti/workflow/manager/executions/executors/blocks/LLMAttachmentPreparerTest.java
index 479a5c6..1babff4 100644
--- a/src/test/java/it/cnr/isti/workflow/manager/executions/executors/blocks/LLMAttachmentPreparerTest.java
+++ b/src/test/java/it/cnr/isti/workflow/manager/executions/executors/blocks/LLMAttachmentPreparerTest.java
@@ -120,7 +120,8 @@ class LLMAttachmentPreparerTest {
         LLMAttachmentPreparer.Prepared prepared = preparer.prepare(new FileAttachments(List.of(), List.of(report)),
                 "summarise", provider(Set.of(ChatAttachment.Kind.IMAGE), true), "m", null);
 
-        assertTrue(prepared.documentText().contains("--- Attached document: report.pdf (3 pages) ---"), prepared.documentText());
+        assertTrue(prepared.documentText().contains("You were given the document report.pdf (3 pages)."), prepared.documentText());
+        assertTrue(prepared.documentText().contains("<<<BEGIN report.pdf>>>"), prepared.documentText());
         assertTrue(prepared.documentText().contains("Quarterly revenue grew"), prepared.documentText());
         assertTrue(prepared.documentText().contains("first 2 pages are also attached as images, of 3"), prepared.documentText());
         assertEquals(List.of("report.pdf-page-1.jpg", "report.pdf-page-2.jpg"),