diff --git a/.env.example b/.env.example
index 3747b61..3a76bc3 100644
--- a/.env.example
+++ b/.env.example
@@ -118,8 +118,10 @@ MAX_REQUEST_BYTES=209715200
 MAX_FILE_BYTES=20971520
 # Max page images accepted in one chapter upload. Bounds how many parts
 # the handler will stage before rejecting the request with 413, so a
-# client can't pin a worker with an unbounded page count. 0 disables the
-# cap. Default 2000.
+# client can't pin a worker with an unbounded page count. Default 2000.
+# Setting 0 disables THIS cap — the total is then bounded only by
+# MAX_REQUEST_BYTES (the whole-request body limit above), so leave 0 only
+# if you intend that body limit to be the sole backstop.
 MAX_PAGES_PER_CHAPTER=2000
 
 # ----- Crawler download safety -----
diff --git a/backend/src/config.rs b/backend/src/config.rs
index d9bcd9a..26c778d 100644
--- a/backend/src/config.rs
+++ b/backend/src/config.rs
@@ -66,8 +66,10 @@ pub struct UploadConfig {
     pub max_file_bytes: usize,
     /// Max page images accepted in one chapter upload. Bounds how many
     /// parts the handler will stage before giving up, so a client can't
-    /// pin a worker streaming an unbounded page count. `0` disables the
-    /// cap. Defaults to 2000. `MAX_PAGES_PER_CHAPTER`.
+    /// pin a worker streaming an unbounded page count. `0` disables THIS
+    /// cap — the total is then bounded only by `max_request_bytes` (the
+    /// whole-request body limit), which stays the backstop either way.
+    /// Defaults to 2000. `MAX_PAGES_PER_CHAPTER`.
     pub max_pages_per_chapter: usize,
 }