diff --git a/.gitea/workflows/test.yml b/.gitea/workflows/test.yml
index 12ef529..99c9e47 100644
--- a/.gitea/workflows/test.yml
+++ b/.gitea/workflows/test.yml
@@ -105,6 +105,6 @@ jobs:
         run: go build -o bin/interpres-decode ./cmd/interpres-decode
 
       - name: Compliance suite
-        # interpres implements TOML 1.0 and 1.1; the mode is pinned so an upstream
+        # interpres implements TOML 1.1; the mode is pinned so an upstream
         # default change cannot silently move the corpus.
         run: bin/toml-test test -decoder=bin/interpres-decode -toml=1.1
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2e03c9a..8923205 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -13,6 +13,12 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Changed
 
+- TOML 1.1 is the acceptance contract, and TOML 1.0 is not. The compliance
+  suite runs the 1.1 corpus alone, and the promise that every 1.0 document
+  parses exactly as before is withdrawn. Nothing that parses today stops
+  parsing: the 1.0 valid corpus still passes in full. The documents whose
+  verdict changes are the ones 1.1 relaxed, such as the `\xHH` escape
+  sequences 1.0 rejected.
 - The module path carries the /v2 suffix the Go toolchain requires of
   every major version 2 module: imports change to
   `sourcedock.dev/petrbalvin/interpres/v2`.
diff --git a/README.md b/README.md
index a320620..282e4d4 100644
--- a/README.md
+++ b/README.md
@@ -1,14 +1,14 @@
 # interpres
 
-A TOML 1.0 and 1.1 parser and encoder for Go, written with the standard
-library alone. `interpres` (Latin for *interpreter*) gives zero-dependency
+A TOML 1.1 parser and encoder for Go, written with the standard library
+alone. `interpres` (Latin for *interpreter*) gives zero-dependency
 programs an `encoding/json`-style API for reading and writing TOML, and passes
 the entire official [toml-test](https://github.com/toml-lang/toml-test) suite:
 214 valid and 467 invalid cases, zero failures.
 
 ## Features
 
-- **Full TOML 1.0 and 1.1**: bare, quoted and dotted keys; tables and arrays of
+- **Full TOML 1.1**: bare, quoted and dotted keys; tables and arrays of
   tables; basic and literal strings including multiline, with the 1.1 `\e` and
   `\xHH` escapes; integers in the four radixes with `_` separators; floats with
   exponents, `inf` and `nan`; booleans; the four date-time kinds, seconds
diff --git a/docs/API.md b/docs/API.md
index 5b9e5a7..a4ade37 100644
--- a/docs/API.md
+++ b/docs/API.md
@@ -7,10 +7,9 @@ package. The snippets assume:
 import "sourcedock.dev/petrbalvin/interpres/v2"
 ```
 
-The parser accepts TOML 1.0 documents plus the TOML 1.1 extensions: date-times
-and times without seconds, the `\e` and `\xHH` escape sequences, and
-multi-line inline tables with comments and trailing commas. The encoder emits
-TOML 1.0, which is valid under both versions.
+The parser implements TOML 1.1: date-times and times without seconds, the
+`\e` and `\xHH` escape sequences, and multi-line inline tables with comments
+and trailing commas. The encoder emits TOML 1.1.
 
 ## Functions
 
diff --git a/docs/ARCHITECTURE.md b/docs/ARCHITECTURE.md
index dc376a8..39b1cb4 100644
--- a/docs/ARCHITECTURE.md
+++ b/docs/ARCHITECTURE.md
@@ -6,7 +6,7 @@ source tree; nothing is aspirational.
 ## Overview
 
 interpres is one public library package, one command, and one example. The
-library implements the whole of TOML 1.0 and 1.1, decoding and encoding, in the
+library implements the whole of TOML 1.1, decoding and encoding, in the
 standard library alone; the command wraps the parser for the toml-test
 compliance harness, against which it stands at 214 valid and 467 invalid cases
 with zero failures; the example demonstrates the API.
@@ -43,7 +43,7 @@ Inside the library package, one file owns one concern:
 
 | File | Responsibility |
 |---|---|
-| `parser.go` | The recursive-descent parser. Produces the `map[string]any` tree and enforces the structural rules of TOML 1.0 and 1.1 (table redefinitions, dotted keys, arrays of tables, multi-line inline tables). Reports a 1-based line on failure. |
+| `parser.go` | The recursive-descent parser. Produces the `map[string]any` tree and enforces the structural rules of TOML 1.1 (table redefinitions, dotted keys, arrays of tables, multi-line inline tables). Reports a 1-based line on failure. |
 | `number.go` | Strict numeric tokens: integers in the four radixes with `_` separators, and floats including `inf` and `nan`. Rejects leading zeros, misplaced underscores and malformed fractions. |
 | `datetime.go` | The three local date-time wrapper types and `parseDateTime`, which classifies a token into the four date-time kinds under the strict TOML grammar. |
 | `decode.go` | Maps the parsed tree onto Go values by reflection: struct fields, maps, slices, scalar conversion with overflow checks, `Unmarshaler` dispatch. |
diff --git a/interpres.go b/interpres.go
index bfce423..3f7f268 100644
--- a/interpres.go
+++ b/interpres.go
@@ -198,8 +198,7 @@ type Unmarshaler interface {
 	UnmarshalTOML(data any) error
 }
 
-// Marshal returns the TOML encoding of v. The output stays within TOML 1.0,
-// so it is valid under both TOML 1.0 and 1.1.
+// Marshal returns the TOML encoding of v. The output is valid TOML 1.1.
 //
 // Marshal traverses v using reflection and applies the following rules:
 //