diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..15a5c58
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1 @@
+*.h linguist-language=C
diff --git a/docs/source/vec3.rst b/docs/source/vec3.rst
index 100e849..5407b61 100644
--- a/docs/source/vec3.rst
+++ b/docs/source/vec3.rst
@@ -392,7 +392,7 @@ Functions documentation
     Parameters:
       | *[in, out]*  **v**      vector
       | *[in]*       **axis**   axis vector (will be normalized)
-      | *[out]*      **angle**  angle (radians)
+      | *[in]*       **angle**  angle (radians)
 
 .. c:function:: void  glm_vec3_rotate_m4(mat4 m, vec3 v, vec3 dest)