diff --git a/src/game/genetics/genetics.hpp b/src/game/genetics/genetics.hpp
index 7c567c3..b685461 100644
--- a/src/game/genetics/genetics.hpp
+++ b/src/game/genetics/genetics.hpp
@@ -20,6 +20,9 @@
 #ifndef ANTKEEPER_GENETICS_HPP
 #define ANTKEEPER_GENETICS_HPP
 
+/// Genetic algorithms and data types.
+namespace genetic {}
+
 #include "amino-acid.hpp"
 #include "base.hpp"
 #include "codon.hpp"
diff --git a/src/math/angles.hpp b/src/math/angles.hpp
index f8fe51c..4a05e93 100644
--- a/src/math/angles.hpp
+++ b/src/math/angles.hpp
@@ -25,9 +25,6 @@
 
 namespace math {
 
-/// @addtogroup utility
-/// @{
-
 /**
  * Converts an angle given in radians to degrees.
  *
@@ -88,8 +85,6 @@ inline T wrap_radians(T radians)
 	return std::remainder(radians, two_pi<T>);
 }
 
-/// @}
-
 } // namespace math
 
 #endif // ANTKEEPER_MATH_ANGLES_HPP
diff --git a/src/math/constants.hpp b/src/math/constants.hpp
index 52bca44..06dd6af 100644
--- a/src/math/constants.hpp
+++ b/src/math/constants.hpp
@@ -26,9 +26,6 @@
 
 namespace math {
 
-/// @addtogroup utility
-/// @{
-
 /**
  * Pi.
  */
@@ -97,8 +94,6 @@ constexpr transform<T> identity_transform =
 	{T(1), T(1), T(1)}
 };
 
-/// @}
-
 } // namespace math
 
 #endif // ANTKEEPER_MATH_CONSTANTS_HPP
diff --git a/src/math/interpolation.hpp b/src/math/interpolation.hpp
index 833093b..32a4f5a 100644
--- a/src/math/interpolation.hpp
+++ b/src/math/interpolation.hpp
@@ -29,9 +29,6 @@
 
 namespace math {
 
-/// @addtogroup utility
-/// @{
-
 /**
  * Linearly interpolates between @p x and @p y.
  *
@@ -90,8 +87,6 @@ inline T log_lerp(const T& x, const T& y, S a)
 	return x * std::pow(y / x, a);
 }
 
-/// @}
-
 } // namespace math
 
 #endif // ANTKEEPER_MATH_INTERPOLATION_HPP
diff --git a/src/math/math.hpp b/src/math/math.hpp
index d994225..0f918d9 100644
--- a/src/math/math.hpp
+++ b/src/math/math.hpp
@@ -20,7 +20,7 @@
 #ifndef ANTKEEPER_MATH_HPP
 #define ANTKEEPER_MATH_HPP
 
-/// Contains mathematical functions and data types.
+/// Mathematical functions and data types.
 namespace math {}
 
 /**
diff --git a/src/math/random.hpp b/src/math/random.hpp
index 630eac4..8d4c3c9 100644
--- a/src/math/random.hpp
+++ b/src/math/random.hpp
@@ -25,9 +25,6 @@
 
 namespace math {
 
-/// @addtogroup utility
-/// @{
-
 /**
  * Generates a pseudo-random floating point number on `[start, end)` using std::rand().
  *
@@ -48,8 +45,6 @@ inline T random(T start, T end)
     return static_cast<T>(std::rand()) * rand_max_inverse * (end - start) + start;
 }
 
-/// @}
-
 } // namespace math
 
 #endif // ANTKEEPER_MATH_RANDOM_HPP