diff --git a/CHANGELOG.md b/CHANGELOG.md
index 030f5d9..9eb4a3e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -30,7 +30,8 @@ For major (breaking) changes - version 3 and 2 see end of page.
 
 | Version        | Date           | Comment  |
 | -------------- | -------------- | -------- |
-| 4.15.2         | 2019-11-11     | `mem()` improved calculation linux |
+| 4.15.2         | 2019-11-10     | type definitions and docs update |
+| 4.15.2         | 2019-11-10     | `mem()` improved calculation linux |
 | 4.15.1         | 2019-11-10     | `diskLayout()` added support for older lsblk versions (linux) |
 | 4.15.0         | 2019-11-10     | `cpu()` added governor (linux) |
 | 4.14.17        | 2019-10-22     | `graphics()` improved display detection (windows) |
diff --git a/README.md b/README.md
index 8ad39ab..3b84853 100644
--- a/README.md
+++ b/README.md
@@ -204,6 +204,9 @@ I also created a nice little command line tool called [mmon][mmon-github-url]  (
 | | used | X | X | X | X | X | used (incl. buffers/cache) |
 | | active | X | X | X | X | X | used actively (excl. buffers/cache)  |
 | | buffcache | X | X | X |  | X | used by buffers+cache |
+| | buffers | X |  |  |  |  | used by buffers |
+| | cached | X |  |  |  |  | used by cache |
+| | slab | X |  |  |  |  | used by slab |
 | | available | X | X | X | X | X | potentially available (total - active) |
 | | swaptotal | X | X | X | X | X |  |
 | | swapused | X | X | X | X | X |  |
diff --git a/docs/history.html b/docs/history.html
index 94a1f9c..4b5c709 100644
--- a/docs/history.html
+++ b/docs/history.html
@@ -83,6 +83,11 @@
                   </tr>
                 </thead>
                 <tbody>
+                  <tr>
+                    <th scope="row">4.15.3</th>
+                    <td>2019-11-10</td>
+                    <td><span class="code">type definitions</span> and docs update</td>
+                  </tr>
                   <tr>
                     <th scope="row">4.15.2</th>
                     <td>2019-11-10</td>
diff --git a/docs/memory.html b/docs/memory.html
index 2b72317..eb401f3 100644
--- a/docs/memory.html
+++ b/docs/memory.html
@@ -125,6 +125,36 @@
                     <td>X</td>
                     <td>used by buffers+cache</td>
                   </tr>
+                  <tr>
+                    <td></td>
+                    <td>buffers</td>
+                    <td>X</td>
+                    <td></td>
+                    <td></td>
+                    <td></td>
+                    <td></td>
+                    <td>used by buffers</td>
+                  </tr>
+                  <tr>
+                    <td></td>
+                    <td>cached</td>
+                    <td>X</td>
+                    <td></td>
+                    <td></td>
+                    <td></td>
+                    <td></td>
+                    <td>used by cache</td>
+                  </tr>
+                  <tr>
+                    <td></td>
+                    <td>slab</td>
+                    <td>X</td>
+                    <td></td>
+                    <td></td>
+                    <td></td>
+                    <td></td>
+                    <td>used by slab</td>
+                  </tr>
                   <tr>
                     <td></td>
                     <td>available</td>
diff --git a/lib/index.d.ts b/lib/index.d.ts
index 996fd71..c4991bf 100644
--- a/lib/index.d.ts
+++ b/lib/index.d.ts
@@ -63,6 +63,7 @@ export namespace Systeminformation {
     speed: string;
     speedmin: string;
     speedmax: string;
+    governor: string;
     cores: number;
     physicalCores: number;
     processors: number;
@@ -101,6 +102,9 @@ export namespace Systeminformation {
     active: number;
     available: number;
     buffcache: number;
+    buffers: number;
+    cached: number;
+    slab: number;
     swaptotal: number;
     swapused: number;
     swapfree: number;