diff --git a/src/kvector/kotlin/ru/dbotthepony/kvector/matrix/functions.kt b/src/kvector/kotlin/ru/dbotthepony/kvector/matrix/functions.kt
index 2d9ee255..8bf8599e 100644
--- a/src/kvector/kotlin/ru/dbotthepony/kvector/matrix/functions.kt
+++ b/src/kvector/kotlin/ru/dbotthepony/kvector/matrix/functions.kt
@@ -459,8 +459,9 @@ fun complementMatrix(input: IMatrixGetterLong, column: Int, row: Int, buffer: Lo
  * Computes cofactor matrix of specified square matrix [input],
  * returning result as [Double2Dimensional]
  *
- * This operation requires n * n determinant calculations of matrix,
- * so do cache result of this function in performance critical context.
+ * This operation requires **O(n!)** determinant calculations of matrix,
+ * so do cache result of this function in performance critical context,
+ * because it is calculated analytically.
  *
  * @throws IllegalArgumentException if provided [input] is not a square matrix
  * @return 2d array containing result matrix
@@ -497,8 +498,9 @@ fun cofactorMatrix(input: IMatrixGetterDouble): Double2Dimensional {
  * Computes cofactor matrix of specified square matrix [input],
  * returning result as [Float2Dimensional]
  *
- * This operation requires n * n determinant calculations of matrix,
- * so do cache result of this function in performance critical context.
+ * This operation requires **O(n!)** determinant calculations of matrix,
+ * so do cache result of this function in performance critical context,
+ * because it is calculated analytically.
  *
  * @throws IllegalArgumentException if provided [input] is not a square matrix
  * @return 2d array containing result matrix
@@ -569,8 +571,9 @@ fun adjugateMatrix(input: IMatrixGetterFloat): Float2Dimensional {
  * Computes inverse matrix of specified square matrix [input],
  * returning result as [Double2Dimensional],
  *
- * This operation requires 1 + n * n determinant calculations of original matrix,
- * so do cache result of this function in performance critical context.
+ * This operation requires **O(n! + 1)** determinant calculations of original matrix,
+ * so do cache result of this function in performance critical context,
+ * because it is calculated analytically.
  *
  * If determinant is zero, null is returned.
  *
@@ -601,8 +604,9 @@ fun inverseMatrix(input: IMatrixGetterDouble): Double2Dimensional? {
  * Computes inverse matrix of specified square matrix [input],
  * returning result as [Float2Dimensional],
  *
- * This operation requires 1 + n * n determinant calculations of original matrix,
- * so do cache result of this function in performance critical context.
+ * This operation requires **O(n! + 1)** determinant calculations of original matrix,
+ * so do cache result of this function in performance critical context,
+ * because it is calculated analytically.
  *
  * If determinant is zero, null is returned.
  *
diff --git a/src/test/kotlin/ru/dbotthepony/kstarbound/test/MathTests.kt b/src/test/kotlin/ru/dbotthepony/kstarbound/test/MathTests.kt
index 5e6bb18e..1633c4a7 100644
--- a/src/test/kotlin/ru/dbotthepony/kstarbound/test/MathTests.kt
+++ b/src/test/kotlin/ru/dbotthepony/kstarbound/test/MathTests.kt
@@ -10,7 +10,10 @@ import ru.dbotthepony.kstarbound.world.ChunkPos
 import ru.dbotthepony.kvector.matrix.adjugateMatrix
 import ru.dbotthepony.kvector.matrix.multiplyMatrix
 import ru.dbotthepony.kvector.matrix.inverseMatrix
+import ru.dbotthepony.kvector.matrix.ndouble.MatrixVd
+import ru.dbotthepony.kvector.matrix.ndouble.MutableMatrixVd
 import ru.dbotthepony.kvector.narray.Double2Dimensional
+import java.util.*
 
 object MathTests {
 	@Test