diff --git a/src/Server/Cpu.php b/src/Server/Cpu.php
index ce6c02e..9142bd0 100644
--- a/src/Server/Cpu.php
+++ b/src/Server/Cpu.php
@@ -22,6 +22,7 @@ private function __construct(
     }
 
     /**
+     * @internal
      * @psalm-pure
      */
     public static function of(
diff --git a/src/Server/Cpu/Cores.php b/src/Server/Cpu/Cores.php
index 0fde59a..029e7ab 100644
--- a/src/Server/Cpu/Cores.php
+++ b/src/Server/Cpu/Cores.php
@@ -17,6 +17,7 @@ private function __construct(
     }
 
     /**
+     * @internal
      * @psalm-pure
      *
      * @param int<1, max> $value
diff --git a/src/Server/Cpu/Percentage.php b/src/Server/Cpu/Percentage.php
index 17c787c..869da66 100644
--- a/src/Server/Cpu/Percentage.php
+++ b/src/Server/Cpu/Percentage.php
@@ -16,6 +16,7 @@ private function __construct(
     }
 
     /**
+     * @internal
      * @psalm-pure
      *
      * @return Maybe<self>
diff --git a/src/Server/Disk/LoggerDisk.php b/src/Server/Disk/LoggerDisk.php
index 63f7605..cc3bd7c 100644
--- a/src/Server/Disk/LoggerDisk.php
+++ b/src/Server/Disk/LoggerDisk.php
@@ -24,6 +24,9 @@ private function __construct(Disk $disk, LoggerInterface $logger)
         $this->logger = $logger;
     }
 
+    /**
+     * @internal
+     */
     public static function of(Disk $disk, LoggerInterface $logger): self
     {
         return new self($disk, $logger);
diff --git a/src/Server/Disk/UnixDisk.php b/src/Server/Disk/UnixDisk.php
index 912401b..2f180e0 100644
--- a/src/Server/Disk/UnixDisk.php
+++ b/src/Server/Disk/UnixDisk.php
@@ -41,6 +41,9 @@ private function __construct(Processes $processes)
         $this->processes = $processes;
     }
 
+    /**
+     * @internal
+     */
     public static function of(Processes $processes): self
     {
         return new self($processes);
diff --git a/src/Server/Disk/Volume.php b/src/Server/Disk/Volume.php
index 5fe52b9..e4f09cd 100644
--- a/src/Server/Disk/Volume.php
+++ b/src/Server/Disk/Volume.php
@@ -24,6 +24,7 @@ private function __construct(
     }
 
     /**
+     * @internal
      * @psalm-pure
      */
     public static function of(
diff --git a/src/Server/Disk/Volume/MountPoint.php b/src/Server/Disk/Volume/MountPoint.php
index 85e8eb5..b2bc9aa 100644
--- a/src/Server/Disk/Volume/MountPoint.php
+++ b/src/Server/Disk/Volume/MountPoint.php
@@ -17,6 +17,7 @@ private function __construct(
     }
 
     /**
+     * @internal
      * @psalm-pure
      *
      * @param non-empty-string $value
diff --git a/src/Server/Disk/Volume/Usage.php b/src/Server/Disk/Volume/Usage.php
index f922f9d..271e4d2 100644
--- a/src/Server/Disk/Volume/Usage.php
+++ b/src/Server/Disk/Volume/Usage.php
@@ -16,6 +16,7 @@ private function __construct(
     }
 
     /**
+     * @internal
      * @psalm-pure
      *
      * @return Maybe<self>
diff --git a/src/Server/LoadAverage.php b/src/Server/LoadAverage.php
index 81fd144..e9a99c6 100644
--- a/src/Server/LoadAverage.php
+++ b/src/Server/LoadAverage.php
@@ -18,6 +18,7 @@ private function __construct(
     }
 
     /**
+     * @internal
      * @psalm-pure
      *
      * @return Maybe<self>
diff --git a/src/Server/Memory.php b/src/Server/Memory.php
index 87af0a2..0af8b99 100644
--- a/src/Server/Memory.php
+++ b/src/Server/Memory.php
@@ -20,6 +20,7 @@ private function __construct(
     }
 
     /**
+     * @internal
      * @psalm-pure
      */
     public static function of(
diff --git a/src/Server/Memory/Bytes.php b/src/Server/Memory/Bytes.php
index 1b1ed5c..ba7682b 100644
--- a/src/Server/Memory/Bytes.php
+++ b/src/Server/Memory/Bytes.php
@@ -30,6 +30,7 @@ private function __construct(
     }
 
     /**
+     * @internal
      * @psalm-pure
      *
      * @param int<0, max> $value
@@ -75,6 +76,7 @@ public function toString(): string
     }
 
     /**
+     * @internal
      * @psalm-pure
      *
      * @return Maybe<self>
diff --git a/src/Server/Process.php b/src/Server/Process.php
index 43f3ebd..63c9671 100644
--- a/src/Server/Process.php
+++ b/src/Server/Process.php
@@ -32,6 +32,7 @@ private function __construct(
     }
 
     /**
+     * @internal
      * @psalm-pure
      *
      * @param Maybe<PointInTime> $start
diff --git a/src/Server/Process/Command.php b/src/Server/Process/Command.php
index 8c0eb09..e341991 100644
--- a/src/Server/Process/Command.php
+++ b/src/Server/Process/Command.php
@@ -22,6 +22,7 @@ private function __construct(
     }
 
     /**
+     * @internal
      * @psalm-pure
      *
      * @param non-empty-string $value
diff --git a/src/Server/Process/Memory.php b/src/Server/Process/Memory.php
index a4c79f0..d68cf3b 100644
--- a/src/Server/Process/Memory.php
+++ b/src/Server/Process/Memory.php
@@ -16,6 +16,7 @@ private function __construct(
     }
 
     /**
+     * @internal
      * @psalm-pure
      *
      * @return Maybe<self>
diff --git a/src/Server/Process/Pid.php b/src/Server/Process/Pid.php
index 990d64c..96b4b03 100644
--- a/src/Server/Process/Pid.php
+++ b/src/Server/Process/Pid.php
@@ -17,6 +17,7 @@ private function __construct(
     }
 
     /**
+     * @internal
      * @psalm-pure
      *
      * @param int<1, max> $value
diff --git a/src/Server/Process/User.php b/src/Server/Process/User.php
index 2b3a7e1..712a802 100644
--- a/src/Server/Process/User.php
+++ b/src/Server/Process/User.php
@@ -17,6 +17,7 @@ private function __construct(
     }
 
     /**
+     * @internal
      * @psalm-pure
      *
      * @param non-empty-string $value
diff --git a/src/Server/Processes/LoggerProcesses.php b/src/Server/Processes/LoggerProcesses.php
index 9209ab5..88d7f46 100644
--- a/src/Server/Processes/LoggerProcesses.php
+++ b/src/Server/Processes/LoggerProcesses.php
@@ -26,6 +26,9 @@ private function __construct(Processes $processes, LoggerInterface $logger)
         $this->logger = $logger;
     }
 
+    /**
+     * @internal
+     */
     public static function of(Processes $processes, LoggerInterface $logger): self
     {
         return new self($processes, $logger);
diff --git a/src/Server/Processes/UnixProcesses.php b/src/Server/Processes/UnixProcesses.php
index 1aaad19..2a79ff9 100644
--- a/src/Server/Processes/UnixProcesses.php
+++ b/src/Server/Processes/UnixProcesses.php
@@ -37,6 +37,9 @@ private function __construct(Clock $clock, Control\Processes $processes)
         $this->processes = $processes;
     }
 
+    /**
+     * @internal
+     */
     public static function of(Clock $clock, Control\Processes $processes): self
     {
         return new self($clock, $processes);
diff --git a/src/Servers/Linux.php b/src/Servers/Linux.php
index 275eb3d..ee9d919 100644
--- a/src/Servers/Linux.php
+++ b/src/Servers/Linux.php
@@ -35,6 +35,9 @@ private function __construct(Clock $clock, Control $control)
         $this->disk = UnixDisk::of($control->processes());
     }
 
+    /**
+     * @internal
+     */
     public static function of(Clock $clock, Control $control): self
     {
         return new self($clock, $control);
diff --git a/src/Servers/OSX.php b/src/Servers/OSX.php
index cdd1f01..b2eb503 100644
--- a/src/Servers/OSX.php
+++ b/src/Servers/OSX.php
@@ -36,6 +36,9 @@ private function __construct(Clock $clock, Control $control, EnvironmentPath $pa
         $this->disk = UnixDisk::of($control->processes());
     }
 
+    /**
+     * @internal
+     */
     public static function of(Clock $clock, Control $control, EnvironmentPath $path): self
     {
         return new self($clock, $control, $path);