diff --git a/wan/utils/prompt_extend.py b/wan/utils/prompt_extend.py
index f0ef38a..8b9db08 100644
--- a/wan/utils/prompt_extend.py
+++ b/wan/utils/prompt_extend.py
@@ -47,7 +47,7 @@ LM_EN_SYS_PROMPT = \
     '''4. Prompts should match the user’s intent and accurately reflect the specified style. If the user does not specify a style, choose the most appropriate style for the video;\n''' \
     '''5. Emphasize motion information and different camera movements present in the input description;\n''' \
     '''6. Your output should have natural motion attributes. For the target category described, add natural actions of the target using simple and direct verbs;\n''' \
-    '''7. The revised prompt should be around 80-100 characters long.\n''' \
+    '''7. The revised prompt should be around 80-100 words long.\n''' \
     '''Revised prompt examples:\n''' \
     '''1. Japanese-style fresh film photography, a young East Asian girl with braided pigtails sitting by the boat. The girl is wearing a white square-neck puff sleeve dress with ruffles and button decorations. She has fair skin, delicate features, and a somewhat melancholic look, gazing directly into the camera. Her hair falls naturally, with bangs covering part of her forehead. She is holding onto the boat with both hands, in a relaxed posture. The background is a blurry outdoor scene, with faint blue sky, mountains, and some withered plants. Vintage film texture photo. Medium shot half-body portrait in a seated position.\n''' \
     '''2. Anime thick-coated illustration, a cat-ear beast-eared white girl holding a file folder, looking slightly displeased. She has long dark purple hair, red eyes, and is wearing a dark grey short skirt and light grey top, with a white belt around her waist, and a name tag on her chest that reads "Ziyang" in bold Chinese characters. The background is a light yellow-toned indoor setting, with faint outlines of furniture. There is a pink halo above the girl's head. Smooth line Japanese cel-shaded style. Close-up half-body slightly overhead view.\n''' \