diff --git a/docs/modules/linalg.md b/docs/modules/linalg.md
index e993e124..68c58145 100644
--- a/docs/modules/linalg.md
+++ b/docs/modules/linalg.md
@@ -3,10 +3,11 @@ icon: package
 label: linalg
 ---
 
-Provide `mat3x3`, `vec2` and `vec3` types.
+Provide `mat3x3`, `vec2`, `vec3` and `vec4` types.
 
 ```python
 from typing import overload
+from c import float_p
 
 class vec2:
     x: float
@@ -24,6 +25,7 @@ class vec2:
     def length_squared(self) -> float: ...
     def normalize(self) -> vec2: ...
     def rotate(self, radians: float) -> vec2: ...
+    def addr(self) -> float_p: ...
 
 class vec3:
     x: float
@@ -41,6 +43,25 @@ class vec3:
     def length(self) -> float: ...
     def length_squared(self) -> float: ...
     def normalize(self) -> vec3: ...
+    def addr(self) -> float_p: ...
+
+class vec4:
+    x: float
+    y: float
+    z: float
+    w: float
+
+    def __init__(self, x: float, y: float, z: float, w: float) -> None: ...
+    def copy(self) -> vec4: ...
+    def __add__(self, other: vec4) -> vec4: ...
+    def __sub__(self, other: vec4) -> vec4: ...
+    def __mul__(self, other: float) -> vec4: ...
+    def __truediv__(self, other: float) -> vec4: ...
+    def dot(self, other: vec4) -> float: ...
+    def length(self) -> float: ...
+    def length_squared(self) -> float: ...
+    def normalize(self) -> vec4: ...
+    def addr(self) -> float_p: ...
 
 class mat3x3:
     _11: float
@@ -83,6 +104,8 @@ class mat3x3:
     def transpose(self) -> mat3x3: ...
     def inverse(self) -> mat3x3: ...
 
+    def __invert__(self) -> mat3x3: ...
+
     @staticmethod
     def zeros() -> mat3x3: ...
     @staticmethod
@@ -95,8 +118,6 @@ class mat3x3:
     def trs(t: vec2, r: float, s: vec2) -> mat3x3: ...
 
     def is_affine(self) -> bool: ...
-    def inverse_affine(self) -> mat3x3: ...
-    def matmul_affine(self, other: mat3x3) -> mat3x3: ...
 
     def translation(self) -> vec2: ...
     def rotation(self) -> float: ...
diff --git a/run_tests.sh b/run_tests.sh
index d9b19d5d..2b964aa8 100644
--- a/run_tests.sh
+++ b/run_tests.sh
@@ -10,6 +10,7 @@ fi
 
 rm -rf .coverage
 mkdir .coverage
+rm pocketpy_c.gcno
 UNITS=$(find ./ -name "*.gcno")
 llvm-cov-15 gcov ${UNITS} -r -s include/ -r -s src/ >> .coverage/coverage.txt
 mv *.gcov .coverage