docs(cnn_v3): clarify --output is a base dir, not a frame_### pattern

1 files changed, 5 insertions, 3 deletions

diff --git a/cnn_v3/docs/HOW_TO_CNN.md b/cnn_v3/docs/HOW_TO_CNN.md
index de20cd9..3013e1c 100644
--- a/cnn_v3/docs/HOW_TO_CNN.md
+++ b/cnn_v3/docs/HOW_TO_CNN.md
@@ -146,19 +146,21 @@ Produces all 20 feature channels including normals, depth, mat IDs, and shadow.
 
 ```bash
 blender -b scene.blend -P cnn_v3/training/blender_export.py -- \
-    --output /tmp/renders/frame_### \
+    --output /tmp/renders/ \
     --width 640 --height 360 \
     --start-frame 1 --end-frame 200
 ```
 
 The `--` separator is **required**; arguments after it are passed to the Python script,
-not to Blender. Each `#` in `--output` is replaced by a zero-padded frame digit.
+not to Blender. `--output` is the base directory for the compositor File Output node;
+Blender appends the slot name and frame number automatically (e.g. `Combined0001.exr`).
+`//` is a Blender shorthand for the directory containing the `.blend` file.
 
 **Available flags:**
 
 | Flag | Default | Notes |
 |------|---------|-------|
-| `--output PATH` | `//renders/frame_###` | `//` = blend file directory; `###` = frame padding |
+| `--output PATH` | `//renders/` | Base output directory; `//` = blend file directory |
 | `--width N` | 640 | Render resolution |
 | `--height N` | 360 | Render resolution |
 | `--start-frame N` | scene start | First frame |