diff --git a/src/main/java/org/teacon/slides/screen/SlideItemScreen.java b/src/main/java/org/teacon/slides/screen/SlideItemScreen.java
index 866907f..4511cee 100644
--- a/src/main/java/org/teacon/slides/screen/SlideItemScreen.java
+++ b/src/main/java/org/teacon/slides/screen/SlideItemScreen.java
@@ -1,6 +1,7 @@
 package org.teacon.slides.screen;
 
 import com.mojang.blaze3d.systems.RenderSystem;
+import net.minecraft.ChatFormatting;
 import net.minecraft.FieldsAreNonnullByDefault;
 import net.minecraft.MethodsReturnNonnullByDefault;
 import net.minecraft.client.gui.GuiGraphics;
@@ -37,7 +38,29 @@ public final class SlideItemScreen extends AbstractContainerScreen<SlideItemCont
     private static final Component
             IMAGE_TEXT = Component.translatable("gui.slide_show.section.image"),
             URL_TEXT = Component.translatable("gui.slide_show.url"),
-            SIZE_TEXT = Component.translatable("gui.slide_show.size");
+            SIZE_TEXT = Component.translatable("gui.slide_show.size"),
+            SIZE_HINT_1 = Component.translatable("gui.slide_show.size_hint.two",
+                            Component.literal("contain").withStyle(ChatFormatting.AQUA),
+                            Component.literal("cover").withStyle(ChatFormatting.AQUA))
+                    .withStyle(ChatFormatting.GRAY),
+            SIZE_HINT_2 = Component.translatable("gui.slide_show.size_hint.contain_or_cover")
+                    .withStyle(ChatFormatting.GRAY),
+            SIZE_HINT_3 = Component.translatable("gui.slide_show.size_hint.two",
+                            Component.literal("<width>% auto").withStyle(ChatFormatting.AQUA),
+                            Component.literal("<width>%").withStyle(ChatFormatting.AQUA))
+                    .withStyle(ChatFormatting.GRAY),
+            SIZE_HINT_4 = Component.translatable("gui.slide_show.size_hint.height_auto")
+                    .withStyle(ChatFormatting.GRAY),
+            SIZE_HINT_5 = Component.translatable("gui.slide_show.size_hint.one",
+                            Component.literal("auto <height>%").withStyle(ChatFormatting.AQUA))
+                    .withStyle(ChatFormatting.GRAY),
+            SIZE_HINT_6 = Component.translatable("gui.slide_show.size_hint.width_auto")
+                    .withStyle(ChatFormatting.GRAY),
+            SIZE_HINT_7 = Component.translatable("gui.slide_show.size_hint.one",
+                            Component.literal("<width>% <height>%").withStyle(ChatFormatting.AQUA))
+                    .withStyle(ChatFormatting.GRAY),
+            SIZE_HINT_8 = Component.translatable("gui.slide_show.size_hint.both")
+                    .withStyle(ChatFormatting.GRAY);
 
     private static final int
             URL_MAX_LENGTH = 1 << 9,
@@ -180,7 +203,11 @@ protected void renderTooltip(GuiGraphics gui, int mouseX, int mouseY) {
         if (offsetX >= 7 && offsetY >= 35 && offsetX < 25 && offsetY < 54) {
             gui.renderComponentTooltip(font, this.getUrlTexts(), mouseX, mouseY);
         } else if (offsetX >= 7 && offsetY >= 57 && offsetX < 25 && offsetY < 76) {
-            gui.renderTooltip(font, SIZE_TEXT, mouseX, mouseY);
+            gui.renderComponentTooltip(font, List.of(SIZE_TEXT,
+                    Component.literal(""), SIZE_HINT_1, SIZE_HINT_2,
+                    Component.literal(""), SIZE_HINT_3, SIZE_HINT_4,
+                    Component.literal(""), SIZE_HINT_5, SIZE_HINT_6,
+                    Component.literal(""), SIZE_HINT_7, SIZE_HINT_8), mouseX, mouseY);
         }
     }
 
diff --git a/src/main/resources/assets/slide_show/lang/en_us.json b/src/main/resources/assets/slide_show/lang/en_us.json
index 50342bf..66d791f 100644
--- a/src/main/resources/assets/slide_show/lang/en_us.json
+++ b/src/main/resources/assets/slide_show/lang/en_us.json
@@ -38,6 +38,13 @@
     "gui.slide_show.rotate": "Rotate Clockwise",
     "gui.slide_show.single_double_sided": "Switch Single-Sided / Double-Sided",
 
+    "gui.slide_show.size_hint.one": "%s",
+    "gui.slide_show.size_hint.two": "%s or %s",
+    "gui.slide_show.size_hint.contain_or_cover": "While preserving its aspect ratio, the image is rendered at the largest size contained within, or covering, the projection area defined by the projector",
+    "gui.slide_show.size_hint.height_auto": "The width will be stretched to the specified percentage while the height is computed using the image's corresponding aspect ratio",
+    "gui.slide_show.size_hint.width_auto": "The height will be stretched to the specified percentage while the width is computed using the image's corresponding aspect ratio",
+    "gui.slide_show.size_hint.both": "The width and the height will be stretched to the specified percentage of the projection area defined by the projector",
+
     "gui.slide_show.log_comment": "at %s by %s",
     "gui.slide_show.log_comment_nobody": "at %s",
     "gui.slide_show.log_message.slide_show.create_url": "The image was created in the server",
diff --git a/src/main/resources/assets/slide_show/lang/zh_cn.json b/src/main/resources/assets/slide_show/lang/zh_cn.json
index 12d951b..4d9be31 100644
--- a/src/main/resources/assets/slide_show/lang/zh_cn.json
+++ b/src/main/resources/assets/slide_show/lang/zh_cn.json
@@ -38,6 +38,13 @@
     "gui.slide_show.rotate": "顺时针旋转",
     "gui.slide_show.single_double_sided": "切换单面/双面",
 
+    "gui.slide_show.size_hint.one": "%s",
+    "gui.slide_show.size_hint.two": "%s 或 %s",
+    "gui.slide_show.size_hint.contain_or_cover": "缩放图片以完全覆盖（cover）或最大包含（contain）投影仪定义的投影区域",
+    "gui.slide_show.size_hint.height_auto": "宽度使用指定百分比，未指定的高度依图片固有长宽比例计算",
+    "gui.slide_show.size_hint.width_auto": "高度使用指定百分比，未指定的宽度依图片固有长宽比例计算",
+    "gui.slide_show.size_hint.both": "宽度和高度将拉伸至投影仪定义的投影区域的指定百分比",
+
     "gui.slide_show.log_comment": "%s（操作者：%s）",
     "gui.slide_show.log_comment_nobody": "%s",
     "gui.slide_show.log_message.slide_show.create_url": "该图片在服务器的创建时间：",