diff --git a/README.md b/README.md
index 195cd991f..86634ad38 100644
--- a/README.md
+++ b/README.md
@@ -110,7 +110,7 @@ submit a feature request if you want something to be implemented first.
 * ### [kmath-complex](kmath-complex)
 > Complex numbers and quaternions.
 >
-> **Maturity**: DEVELOPMENT
+> **Maturity**: PROTOTYPE
 >
 > **Features:**
 > - [complex](kmath-complex/src/commonMain/kotlin/kscience/kmath/complex/Complex.kt) : Complex Numbers
@@ -125,7 +125,7 @@ submit a feature request if you want something to be implemented first.
 >
 > **Features:**
 > - [algebras](kmath-core/src/commonMain/kotlin/kscience/kmath/operations/Algebra.kt) : Algebraic structures: contexts and elements
-> - [nd](kmath-core/src/commonMain/kotlin/kscience/kmath/nd/NDStructure.kt) : Many-dimensional structures
+> - [nd](kmath-core/src/commonMain/kotlin/kscience/kmath/structures/NDStructure.kt) : Many-dimensional structures
 > - [buffers](kmath-core/src/commonMain/kotlin/kscience/kmath/structures/Buffers.kt) : One-dimensional structure
 > - [expressions](kmath-core/src/commonMain/kotlin/kscience/kmath/expressions) : Functional Expressions
 > - [domains](kmath-core/src/commonMain/kotlin/kscience/kmath/domains) : Domains
@@ -180,7 +180,7 @@ One can still use generic algebras though.
 * ### [kmath-histograms](kmath-histograms)
 > 
 >
-> **Maturity**: EXPERIMENTAL
+> **Maturity**: PROTOTYPE
 <hr/>
 
 * ### [kmath-kotlingrad](kmath-kotlingrad)
@@ -249,8 +249,8 @@ repositories {
 }
 
 dependencies {
-    api("kscience.kmath:kmath-core:0.2.0-dev-4")
-    // api("kscience.kmath:kmath-core-jvm:0.2.0-dev-4") for jvm-specific version
+    api("kscience.kmath:kmath-core:0.2.0-dev-6")
+    // api("kscience.kmath:kmath-core-jvm:0.2.0-dev-6") for jvm-specific version
 }
 ```
 
diff --git a/kmath-ast/README.md b/kmath-ast/README.md
index 19e9ee4a9..8499f7171 100644
--- a/kmath-ast/README.md
+++ b/kmath-ast/README.md
@@ -12,7 +12,7 @@ This subproject implements the following features:
 
 > #### Artifact:
 >
-> This module artifact: `kscience.kmath:kmath-ast:0.2.0-dev-4`.
+> This module artifact: `kscience.kmath:kmath-ast:0.2.0-dev-6`.
 >
 > Bintray release version:        [ ![Download](https://api.bintray.com/packages/mipt-npm/kscience/kmath-ast/images/download.svg) ](https://bintray.com/mipt-npm/kscience/kmath-ast/_latestVersion)
 >
@@ -30,7 +30,7 @@ This subproject implements the following features:
 > }
 > 
 > dependencies {
->     implementation 'kscience.kmath:kmath-ast:0.2.0-dev-4'
+>     implementation 'kscience.kmath:kmath-ast:0.2.0-dev-6'
 > }
 > ```
 > **Gradle Kotlin DSL:**
@@ -44,7 +44,7 @@ This subproject implements the following features:
 > }
 > 
 > dependencies {
->     implementation("kscience.kmath:kmath-ast:0.2.0-dev-4")
+>     implementation("kscience.kmath:kmath-ast:0.2.0-dev-6")
 > }
 > ```
 
diff --git a/kmath-complex/README.md b/kmath-complex/README.md
index 39efea161..eecb6b205 100644
--- a/kmath-complex/README.md
+++ b/kmath-complex/README.md
@@ -8,7 +8,7 @@ Complex and hypercomplex number systems in KMath:
 
 > #### Artifact:
 >
-> This module artifact: `kscience.kmath:kmath-complex:0.2.0-dev-4`.
+> This module artifact: `kscience.kmath:kmath-complex:0.2.0-dev-6`.
 >
 > Bintray release version:        [ ![Download](https://api.bintray.com/packages/mipt-npm/kscience/kmath-complex/images/download.svg) ](https://bintray.com/mipt-npm/kscience/kmath-complex/_latestVersion)
 >
@@ -26,7 +26,7 @@ Complex and hypercomplex number systems in KMath:
 > }
 > 
 > dependencies {
->     implementation 'kscience.kmath:kmath-complex:0.2.0-dev-4'
+>     implementation 'kscience.kmath:kmath-complex:0.2.0-dev-6'
 > }
 > ```
 > **Gradle Kotlin DSL:**
@@ -40,6 +40,6 @@ Complex and hypercomplex number systems in KMath:
 > }
 > 
 > dependencies {
->     implementation("kscience.kmath:kmath-complex:0.2.0-dev-4")
+>     implementation("kscience.kmath:kmath-complex:0.2.0-dev-6")
 > }
 > ```
diff --git a/kmath-core/README.md b/kmath-core/README.md
index 9ed54b9eb..a66dc282d 100644
--- a/kmath-core/README.md
+++ b/kmath-core/README.md
@@ -3,7 +3,7 @@
 The core features of KMath:
 
  - [algebras](src/commonMain/kotlin/kscience/kmath/operations/Algebra.kt) : Algebraic structures: contexts and elements
- - [nd](src/commonMain/kotlin/kscience/kmath/nd/NDStructure.kt) : Many-dimensional structures
+ - [nd](src/commonMain/kotlin/kscience/kmath/structures/NDStructure.kt) : Many-dimensional structures
  - [buffers](src/commonMain/kotlin/kscience/kmath/structures/Buffers.kt) : One-dimensional structure
  - [expressions](src/commonMain/kotlin/kscience/kmath/expressions) : Functional Expressions
  - [domains](src/commonMain/kotlin/kscience/kmath/domains) : Domains
@@ -12,7 +12,7 @@ The core features of KMath:
 
 > #### Artifact:
 >
-> This module artifact: `kscience.kmath:kmath-core:0.2.0-dev-4`.
+> This module artifact: `kscience.kmath:kmath-core:0.2.0-dev-6`.
 >
 > Bintray release version:        [ ![Download](https://api.bintray.com/packages/mipt-npm/kscience/kmath-core/images/download.svg) ](https://bintray.com/mipt-npm/kscience/kmath-core/_latestVersion)
 >
@@ -30,7 +30,7 @@ The core features of KMath:
 > }
 > 
 > dependencies {
->     implementation 'kscience.kmath:kmath-core:0.2.0-dev-4'
+>     implementation 'kscience.kmath:kmath-core:0.2.0-dev-6'
 > }
 > ```
 > **Gradle Kotlin DSL:**
@@ -44,6 +44,6 @@ The core features of KMath:
 > }
 > 
 > dependencies {
->     implementation("kscience.kmath:kmath-core:0.2.0-dev-4")
+>     implementation("kscience.kmath:kmath-core:0.2.0-dev-6")
 > }
 > ```
diff --git a/kmath-for-real/README.md b/kmath-for-real/README.md
index d6b66b7da..9b191121d 100644
--- a/kmath-for-real/README.md
+++ b/kmath-for-real/README.md
@@ -7,7 +7,7 @@
 
 > #### Artifact:
 >
-> This module artifact: `kscience.kmath:kmath-for-real:0.2.0-dev-4`.
+> This module artifact: `kscience.kmath:kmath-for-real:0.2.0-dev-6`.
 >
 > Bintray release version:        [ ![Download](https://api.bintray.com/packages/mipt-npm/kscience/kmath-for-real/images/download.svg) ](https://bintray.com/mipt-npm/kscience/kmath-for-real/_latestVersion)
 >
@@ -25,7 +25,7 @@
 > }
 > 
 > dependencies {
->     implementation 'kscience.kmath:kmath-for-real:0.2.0-dev-4'
+>     implementation 'kscience.kmath:kmath-for-real:0.2.0-dev-6'
 > }
 > ```
 > **Gradle Kotlin DSL:**
@@ -39,6 +39,6 @@
 > }
 > 
 > dependencies {
->     implementation("kscience.kmath:kmath-for-real:0.2.0-dev-4")
+>     implementation("kscience.kmath:kmath-for-real:0.2.0-dev-6")
 > }
 > ```
diff --git a/kmath-nd4j/README.md b/kmath-nd4j/README.md
index ff4ff4542..5ef42bab3 100644
--- a/kmath-nd4j/README.md
+++ b/kmath-nd4j/README.md
@@ -9,7 +9,7 @@ This subproject implements the following features:
 
 > #### Artifact:
 >
-> This module artifact: `kscience.kmath:kmath-nd4j:0.2.0-dev-4`.
+> This module artifact: `kscience.kmath:kmath-nd4j:0.2.0-dev-6`.
 >
 > Bintray release version:        [ ![Download](https://api.bintray.com/packages/mipt-npm/kscience/kmath-nd4j/images/download.svg) ](https://bintray.com/mipt-npm/kscience/kmath-nd4j/_latestVersion)
 >
@@ -27,7 +27,7 @@ This subproject implements the following features:
 > }
 > 
 > dependencies {
->     implementation 'kscience.kmath:kmath-nd4j:0.2.0-dev-4'
+>     implementation 'kscience.kmath:kmath-nd4j:0.2.0-dev-6'
 > }
 > ```
 > **Gradle Kotlin DSL:**
@@ -41,7 +41,7 @@ This subproject implements the following features:
 > }
 > 
 > dependencies {
->     implementation("kscience.kmath:kmath-nd4j:0.2.0-dev-4")
+>     implementation("kscience.kmath:kmath-nd4j:0.2.0-dev-6")
 > }
 > ```