diff --git a/doc/manual/souce/language/operators.md b/doc/manual/souce/language/operators.md
index 80399c7..aa949b1 100644
--- a/doc/manual/souce/language/operators.md
+++ b/doc/manual/souce/language/operators.md
@@ -2,6 +2,37 @@
 
 この章では、Decodal の演算子の意味を定義する。
 
+## 演算子一覧
+
+| 演算子 | 形 | 種類 | 対象 | 結果 / 意味 |
+|---|---|---|---|---|
+| `.` | `object.field` | field reference | object / abstract object | field value |
+| call | `fn(arg)` | function call | function | function result |
+| `!` | `!expr` | unary logical | concrete `Bool` | concrete `Bool` |
+| `-` | `-expr` | unary arithmetic | concrete `Int` / `Float` | negated number |
+| `*` | `lhs * rhs` | arithmetic | concrete `Int` / `Float` | numeric product |
+| `/` | `lhs / rhs` | arithmetic | concrete `Int` / `Float` | `Float` quotient |
+| `+` | `lhs + rhs` | arithmetic | concrete `Int` / `Float` | numeric sum |
+| `-` | `lhs - rhs` | arithmetic | concrete `Int` / `Float` | numeric difference |
+| `==` | `lhs == rhs` | equality | concrete scalar | concrete `Bool` |
+| `!=` | `lhs != rhs` | equality | concrete scalar | concrete `Bool` |
+| `<` | `lhs < rhs` | ordering | concrete `Int` / `Float` | concrete `Bool` |
+| `<=` | `lhs <= rhs` | ordering | concrete `Int` / `Float` | concrete `Bool` |
+| `>` | `lhs > rhs` | ordering | concrete `Int` / `Float` | concrete `Bool` |
+| `>=` | `lhs >= rhs` | ordering | concrete `Int` / `Float` | concrete `Bool` |
+| `>` | `> value` | comparison constraint | numeric constraint value | abstract constraint |
+| `>=` | `>= value` | comparison constraint | numeric constraint value | abstract constraint |
+| `<` | `< value` | comparison constraint | numeric constraint value | abstract constraint |
+| `<=` | `<= value` | comparison constraint | numeric constraint value | abstract constraint |
+| `&&` | `lhs && rhs` | logical | concrete `Bool` | short-circuit AND |
+| `||` | `lhs || rhs` | logical | concrete `Bool` | short-circuit OR |
+| `&` | `lhs & rhs` | composition | value / constraint / object | constraint-preserving composition |
+| `//` | `lhs // rhs` | patch | object / value | right-biased structural patch |
+| `default` | `base default fallback` | default | abstract value | materialization fallback |
+
+`concrete scalar` は `String`、`Bool`、`Int`、`Float` を指す。
+`++` による array concat は未導入である。
+
 ## 優先順位
 
 優先順位は高い順に以下である。
diff --git a/site/decodal-site/src/lib/docs.js b/site/decodal-site/src/lib/docs.js
index 0f620f0..e2822b3 100644
--- a/site/decodal-site/src/lib/docs.js
+++ b/site/decodal-site/src/lib/docs.js
@@ -56,7 +56,7 @@ export const nav = [
         ],
       },
       { title: 'Constraints and Defaults', slug: 'language/constraints-and-defaults' },
-      { title: 'Composition Operators', slug: 'language/operators' },
+      { title: 'Operators', slug: 'language/operators' },
       { title: 'Functions', slug: 'language/functions' },
       { title: 'Modules and Imports', slug: 'language/modules-and-imports' },
       { title: 'Evaluation Semantics', slug: 'language/evaluation' },
diff --git a/site/decodal-site/src/style.css b/site/decodal-site/src/style.css
index 5147fc2..d8b8ed8 100644
--- a/site/decodal-site/src/style.css
+++ b/site/decodal-site/src/style.css
@@ -194,6 +194,32 @@ main.playground {
   padding: 1px 4px;
 }
 
+.markdown table {
+  border-collapse: collapse;
+  display: block;
+  margin: 20px 0;
+  overflow-x: auto;
+  width: 100%;
+}
+
+.markdown th,
+.markdown td {
+  border: 1px solid var(--border);
+  padding: 8px 10px;
+  text-align: left;
+  vertical-align: top;
+}
+
+.markdown th {
+  background: var(--inline-code-bg);
+  color: var(--heading);
+  font-weight: 700;
+}
+
+.markdown tr:nth-child(even) td {
+  background: color-mix(in srgb, var(--surface) 92%, var(--border));
+}
+
 .tok-keyword {
   color: #93c5fd;
   font-weight: 700;