diff --git a/Math/Stochastic/Distribution/ExponentialDistribution.php b/Math/Stochastic/Distribution/ExponentialDistribution.php
index d8a5cf646..3ef84e935 100644
--- a/Math/Stochastic/Distribution/ExponentialDistribution.php
+++ b/Math/Stochastic/Distribution/ExponentialDistribution.php
@@ -27,8 +27,8 @@ class ExponentialDistribution
     /**
      * Get probability density function.
      *
-     * @param float $x
-     * @param float $lambda
+     * @param float $x      Value x
+     * @param float $lambda Lambda
      *
      * @return float
      *
@@ -42,8 +42,8 @@ class ExponentialDistribution
     /**
      * Get cumulative distribution function.
      *
-     * @param float $x
-     * @param float $lambda
+     * @param float $x      Value x
+     * @param float $lambda Lambda
      *
      * @return float
      *
@@ -69,7 +69,7 @@ class ExponentialDistribution
     /**
      * Get expected value.
      *
-     * @param float $lambda
+     * @param float $lambda Lambda
      *
      * @return float
      *
@@ -83,7 +83,7 @@ class ExponentialDistribution
     /**
      * Get expected value.
      *
-     * @param float $lambda
+     * @param float $lambda Lambda
      *
      * @return float
      *
@@ -97,7 +97,7 @@ class ExponentialDistribution
     /**
      * Get variance.
      *
-     * @param float $lambda
+     * @param float $lambda Lambda
      *
      * @return float
      *
@@ -111,8 +111,8 @@ class ExponentialDistribution
     /**
      * Get moment generating function.
      *
-     * @param float $t
-     * @param float $lambda
+     * @param float $t      Value t
+     * @param float $lambda Lambda
      *
      * @return float
      *
diff --git a/Math/Stochastic/Distribution/NormalDistribution.php b/Math/Stochastic/Distribution/NormalDistribution.php
index 31ba954aa..596685f78 100644
--- a/Math/Stochastic/Distribution/NormalDistribution.php
+++ b/Math/Stochastic/Distribution/NormalDistribution.php
@@ -28,9 +28,9 @@ class NormalDistribution
     /**
      * Get probability density function.
      *
-     * @param float $x
-     * @param float $mu
-     * @param float $sig
+     * @param float $x   Value x
+     * @param float $mu  Value mu
+     * @param float $sig Sigma
      *
      * @return float
      *
@@ -44,7 +44,7 @@ class NormalDistribution
     /**
      * Get mode.
      *
-     * @param float $mu
+     * @param float $mu Value mu
      *
      * @return float
      *
@@ -58,7 +58,7 @@ class NormalDistribution
     /**
      * Get expected value.
      *
-     * @param float $mu
+     * @param float $mu Value mu
      *
      * @return float
      *
@@ -72,7 +72,7 @@ class NormalDistribution
     /**
      * Get expected value.
      *
-     * @param float $mu
+     * @param float $mu Value mu
      *
      * @return float
      *
@@ -86,7 +86,7 @@ class NormalDistribution
     /**
      * Get variance.
      *
-     * @param float $sig
+     * @param float $sig Sigma
      *
      * @return float
      *
@@ -100,9 +100,9 @@ class NormalDistribution
     /**
      * Get moment generating function.
      *
-     * @param float $t
-     * @param float $mu
-     * @param float $sig
+     * @param float $t   Value t
+     * @param float $mu  Value mu
+     * @param float $sig Sigma
      *
      * @return float
      *
@@ -128,7 +128,7 @@ class NormalDistribution
     /**
      * Get Fisher information.
      *
-     * @param float $sig
+     * @param float $sig Sigma
      *
      * @return array
      *