diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 48a8540..21b6247 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -81,7 +81,7 @@ jobs:
       # a missing backend package would turn the gate below into a formality,
       # so it does not rely on a dev-group entry staying put.
       - name: Sync dependencies
-        run: uv sync --group dev --extra jwt --extra redis --extra memcache
+        run: uv sync --group dev --extra jwt --extra redis --extra memcached
 
       # The gate. A release is the one run where a red test result arrives too
       # late to matter, so everything CI checks elsewhere is checked here too,
diff --git a/CHANGELOG.md b/CHANGELOG.md
index bff1d18..390e755 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -22,6 +22,11 @@ Note that 0.3.3 was never released; 0.3.4 follows 0.3.2.
 - **`CacheLock`, a distributed lock built on backend primitives.** Usable as an async context manager or with direct `acquire`/`release`/`extend`/`locked` calls, raising `LockTimeoutError` on timeout. ([#64](https://github.com/allen0099/FastAPI-CacheX/issues/64))
 - **`expire_if_equals()` backend primitive for owner-checked TTL renewal.** Added to `BaseCacheBackend`, `MemoryBackend`, `AsyncRedisCacheBackend`, and `MemcachedBackend`. ([#64](https://github.com/allen0099/FastAPI-CacheX/issues/64))
 
+- **`memcached` extra for `MemcachedBackend`.** Install with
+  `fastapi-cachex[memcached]`, matching the backend's name. It pulls in the
+  same `pymemcache` dependency as the old `memcache` extra.
+  ([#201](https://github.com/allen0099/FastAPI-CacheX/issues/201))
+
 ### Changed
 
 - **GitHub release notes list one line per change.** Each changelog entry now
@@ -37,6 +42,11 @@ Note that 0.3.3 was never released; 0.3.4 follows 0.3.2.
   `DeprecationWarning` if it clears anything. The retry will be removed in
   0.4.0. ([#125](https://github.com/allen0099/FastAPI-CacheX/issues/125))
 
+- **The `memcache` extra.** Use `memcached` instead. The old name keeps working
+  until 0.4.0 removes it; after that, pip and uv only warn about the unknown
+  extra and install without `pymemcache`.
+  ([#202](https://github.com/allen0099/FastAPI-CacheX/issues/202))
+
 ### Fixed
 
 - **Redis `clear_pattern()` no longer strips a pattern that starts with the key
diff --git a/CLAUDE.md b/CLAUDE.md
index 61713b9..2c050af 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -80,7 +80,7 @@ The library has four independent subsystems:
 All backends implement `BaseCacheBackend` (abstract base in `backends/base.py`):
 - `MemoryBackend`: In-process dict with background cleanup task. Not suitable for multi-process production use.
 - `AsyncRedisCacheBackend` (`backends/redis.py`): Fully async; uses `SCAN` (not `KEYS`) for pattern operations. Requires `redis[hiredis]` and `orjson` extras.
-- `MemcachedBackend` (`backends/memcached.py`): `clear_pattern`/`get_all_keys` are no-ops (return `0`/`[]` with a `RuntimeWarning`) since the Memcached protocol has no key enumeration. Runs the sync pymemcache client in worker threads with connection pooling (`use_pooling=True`, `default_noreply=False`), so concurrent calls never share a socket and every write is acknowledged before the next call on another socket can observe it. Requires `pymemcache` extra.
+- `MemcachedBackend` (`backends/memcached.py`): `clear_pattern`/`get_all_keys` are no-ops (return `0`/`[]` with a `RuntimeWarning`) since the Memcached protocol has no key enumeration. Runs the sync pymemcache client in worker threads with connection pooling (`use_pooling=True`, `default_noreply=False`), so concurrent calls never share a socket and every write is acknowledged before the next call on another socket can observe it. Requires the `memcached` extra (`memcache` is a deprecated alias until 0.4.0).
 
 Backend keys are namespaced automatically (default prefix: `fastapi_cachex:`).
 
diff --git a/README.md b/README.md
index 616e2b4..6b4b50f 100644
--- a/README.md
+++ b/README.md
@@ -42,7 +42,7 @@ backends and the optional session transports ship as extras:
 | Extra | Install | Pulls in | Needed for |
 |-------|---------|----------|------------|
 | `redis` | `uv add "fastapi-cachex[redis]"` | `redis[hiredis]`, `orjson` | `AsyncRedisCacheBackend` |
-| `memcache` | `uv add "fastapi-cachex[memcache]"` | `pymemcache` | `MemcachedBackend` (note: `memcache`, not `memcached`) |
+| `memcached` | `uv add "fastapi-cachex[memcached]"` | `pymemcache` | `MemcachedBackend` (the older `memcache` name still works until 0.4.0) |
 | `jwt` | `uv add "fastapi-cachex[jwt]"` | `PyJWT` | `SessionConfig(token_format="jwt")` |
 
 Extras combine: `uv add "fastapi-cachex[redis,jwt]"`.
diff --git a/docs/BACKENDS.md b/docs/BACKENDS.md
index 9d096df..0da3990 100644
--- a/docs/BACKENDS.md
+++ b/docs/BACKENDS.md
@@ -94,8 +94,10 @@ hiredis will fail to negotiate it.
 
 ## Memcached
 
-Install the extra with `uv add "fastapi-cachex[memcache]"` (note: `memcache`, not
-`memcached`).
+Install the extra with `uv add "fastapi-cachex[memcached]"`. Before 0.3.8 it was
+called `memcache`; that name still works but is deprecated and will be removed in
+0.4.0. An unknown extra only produces a warning at install time, so after 0.4.0
+`fastapi-cachex[memcache]` would install without `pymemcache`.
 
 ```python
 from fastapi_cachex.backends import MemcachedBackend
diff --git a/docs/DEVELOPMENT.md b/docs/DEVELOPMENT.md
index 0d43f68..926257e 100644
--- a/docs/DEVELOPMENT.md
+++ b/docs/DEVELOPMENT.md
@@ -109,7 +109,7 @@ Worth doing whenever a test is written for something security-relevant.
 ## Using tox
 
 tox ensures the code works across different Python versions (3.10-3.14, the
-`env_list` in `tox.ini`). Each environment installs the `redis` and `memcache`
+`env_list` in `tox.ini`). Each environment installs the `redis` and `memcached`
 extras through `tox-uv` and passes the `CACHEX_TEST_*` and
 `CACHEX_REQUIRE_LIVE_SERVERS` variables through, so the opt-in rules above apply
 unchanged.
diff --git a/fastapi_cachex/backends/memcached.py b/fastapi_cachex/backends/memcached.py
index 89476b5..2dde101 100644
--- a/fastapi_cachex/backends/memcached.py
+++ b/fastapi_cachex/backends/memcached.py
@@ -77,7 +77,7 @@ def __init__(
         try:
             from pymemcache import HashClient
         except ImportError:
-            msg = "pymemcache is not installed. Please install it with 'pip install pymemcache'"
+            msg = "pymemcache is not installed. Install it with the extra: pip install 'fastapi-cachex[memcached]'"
             raise CacheXError(msg)
 
         # Pooled connections have no ordering guarantee between each other, so
diff --git a/i18n/zh-TW/docs/BACKENDS.md b/i18n/zh-TW/docs/BACKENDS.md
index d6fc9ac..67cdf2e 100644
--- a/i18n/zh-TW/docs/BACKENDS.md
+++ b/i18n/zh-TW/docs/BACKENDS.md
@@ -71,7 +71,7 @@ BackendProxy.set(backend)
 
 ## Memcached {#memcached}
 
-以 `uv add "fastapi-cachex[memcache]"` 安裝此 extra（注意是 `memcache`，不是 `memcached`）。
+以 `uv add "fastapi-cachex[memcached]"` 安裝此 extra。0.3.8 以前這個 extra 名為 `memcache`；舊名稱仍可使用但已棄用，將於 0.4.0 移除。安裝時遇到不存在的 extra 只會顯示警告，因此 0.4.0 之後 `fastapi-cachex[memcache]` 會裝好套件但不含 `pymemcache`。
 
 ```python
 from fastapi_cachex.backends import MemcachedBackend
diff --git a/i18n/zh-TW/docs/index.md b/i18n/zh-TW/docs/index.md
index 470fe88..351a3d0 100644
--- a/i18n/zh-TW/docs/index.md
+++ b/i18n/zh-TW/docs/index.md
@@ -37,7 +37,7 @@ uv add fastapi-cachex
 | Extra | 安裝 | 帶入套件 | 用途 |
 |-------|------|---------|------|
 | `redis` | `uv add "fastapi-cachex[redis]"` | `redis[hiredis]`、`orjson` | `AsyncRedisCacheBackend` |
-| `memcache` | `uv add "fastapi-cachex[memcache]"` | `pymemcache` | `MemcachedBackend`（注意是 `memcache`，不是 `memcached`） |
+| `memcached` | `uv add "fastapi-cachex[memcached]"` | `pymemcache` | `MemcachedBackend`（舊名稱 `memcache` 在 0.4.0 之前仍可使用） |
 | `jwt` | `uv add "fastapi-cachex[jwt]"` | `PyJWT` | `SessionConfig(token_format="jwt")` |
 
 Extra 可以組合：`uv add "fastapi-cachex[redis,jwt]"`。
diff --git a/pyproject.toml b/pyproject.toml
index 6ff777a..0000617 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -64,6 +64,8 @@ docs = [
 ]
 
 [project.optional-dependencies]
+memcached = ["pymemcache"]
+# Deprecated alias of `memcached`, removed in 0.4.0 (#202).
 memcache = ["pymemcache"]
 redis = ["redis[hiredis]>=5.3.0", "orjson"]
 jwt = ["PyJWT>=2.9.0"]
diff --git a/tox.ini b/tox.ini
index 5ebc3e6..895dfe1 100644
--- a/tox.ini
+++ b/tox.ini
@@ -11,7 +11,7 @@ env_list =
 runner = uv-venv-lock-runner
 extras =
     redis
-    memcache
+    memcached
 # The Redis/Memcached suites are opt-in because they wipe the server they
 # connect to; without these they skip. See tests/live_servers.py.
 passenv =
diff --git a/uv.lock b/uv.lock
index 4d8c6c9..f9272f5 100644
--- a/uv.lock
+++ b/uv.lock
@@ -520,6 +520,9 @@ jwt = [
 memcache = [
     { name = "pymemcache" },
 ]
+memcached = [
+    { name = "pymemcache" },
+]
 redis = [
     { name = "orjson" },
     { name = "redis", extra = ["hiredis"] },
@@ -559,9 +562,10 @@ requires-dist = [
     { name = "pydantic" },
     { name = "pyjwt", marker = "extra == 'jwt'", specifier = ">=2.9.0" },
     { name = "pymemcache", marker = "extra == 'memcache'" },
+    { name = "pymemcache", marker = "extra == 'memcached'" },
     { name = "redis", extras = ["hiredis"], marker = "extra == 'redis'", specifier = ">=5.3.0" },
 ]
-provides-extras = ["memcache", "redis", "jwt"]
+provides-extras = ["memcached", "memcache", "redis", "jwt"]
 
 [package.metadata.requires-dev]
 dev = [