diff --git a/.Jules/palette.md b/.Jules/palette.md
index 27856ba8..4c25f293 100644
--- a/.Jules/palette.md
+++ b/.Jules/palette.md
@@ -1,3 +1,7 @@
 ## 2025-02-18 - Gradio Icon-Only Buttons
 **Learning:** This Gradio app frequently uses icon-only buttons (like 🎲) without text labels or tooltips, making them inaccessible and unclear.
 **Action:** Always verify if `gr.Button` has a descriptive label or if `info` params are available on associated components to provide context.
+
+## 2026-02-07 - Numeric Input Units and Sentinel Values
+**Learning:** Users struggle to guess units (e.g., seconds vs steps) and sentinel values (e.g., -1 for "end of track") in Gradio numeric inputs without explicit guidance.
+**Action:** Always use the `info` parameter on `gr.Number` to explicitly state the unit of measurement and the meaning of any special values like -1 or 0.
diff --git a/acestep/gradio_ui/i18n/en.json b/acestep/gradio_ui/i18n/en.json
index fdc3992f..2f528dc1 100644
--- a/acestep/gradio_ui/i18n/en.json
+++ b/acestep/gradio_ui/i18n/en.json
@@ -85,8 +85,10 @@
     "transcribe_btn": "Transcribe",
     "repainting_controls": "🎨 Repainting Controls (seconds)",
     "repainting_start": "Repainting Start",
+    "repainting_start_info": "Start time in seconds for repainting (0 = beginning)",
     "set_start_btn": "Set Start",
     "repainting_end": "Repainting End",
+    "repainting_end_info": "End time in seconds for repainting (-1 = end of track)",
     "set_end_btn": "Set End",
     "mode_label": "Generation Mode",
     "mode_info": "Simple: describe music in natural language. Custom: full control over caption and lyrics.",
diff --git a/acestep/gradio_ui/i18n/ja.json b/acestep/gradio_ui/i18n/ja.json
index 6653e0b3..fe54e313 100644
--- a/acestep/gradio_ui/i18n/ja.json
+++ b/acestep/gradio_ui/i18n/ja.json
@@ -82,7 +82,9 @@
     "transcribe_btn": "転写",
     "repainting_controls": "🎨 再描画コントロール(秒)",
     "repainting_start": "再描画開始",
+    "repainting_start_info": "再描画開始時間(秒) (0 = 開始)",
     "repainting_end": "再描画終了",
+    "repainting_end_info": "再描画終了時間(秒) (-1 = トラック終了)",
     "mode_label": "生成モード",
     "mode_info": "シンプル：自然言語で音楽を説明。カスタム：キャプションと歌詞を完全にコントロール。",
     "mode_simple": "シンプル",
diff --git a/acestep/gradio_ui/i18n/zh.json b/acestep/gradio_ui/i18n/zh.json
index 8bf5a463..c6c4d3ab 100644
--- a/acestep/gradio_ui/i18n/zh.json
+++ b/acestep/gradio_ui/i18n/zh.json
@@ -82,7 +82,9 @@
     "transcribe_btn": "转录",
     "repainting_controls": "🎨 重绘控制(秒)",
     "repainting_start": "重绘开始",
+    "repainting_start_info": "重绘开始时间(秒) (0 = 开始)",
     "repainting_end": "重绘结束",
+    "repainting_end_info": "重绘结束时间(秒) (-1 = 轨道结束)",
     "mode_label": "生成模式",
     "mode_info": "简单模式：用自然语言描述音乐。自定义模式：完全控制描述和歌词。",
     "mode_simple": "简单",
diff --git a/acestep/gradio_ui/interfaces/generation.py b/acestep/gradio_ui/interfaces/generation.py
index d9389682..7ddf515b 100644
--- a/acestep/gradio_ui/interfaces/generation.py
+++ b/acestep/gradio_ui/interfaces/generation.py
@@ -297,6 +297,7 @@ def create_generation_section(dit_handler, llm_handler, init_params=None, langua
                                 value=0.0,
                                 step=0.1,
                                 scale=2,
+                                info=t("generation.repainting_start_info"),
                             )
                             set_start_btn = gr.Button(
                                 t("generation.set_start_btn"),
@@ -309,6 +310,7 @@ def create_generation_section(dit_handler, llm_handler, init_params=None, langua
                                 minimum=-1,
                                 step=0.1,
                                 scale=2,
+                                info=t("generation.repainting_end_info"),
                             )
                             set_end_btn = gr.Button(
                                 t("generation.set_end_btn"),