diff --git a/README.md b/README.md
index 31af661..6b48485 100644
--- a/README.md
+++ b/README.md
@@ -32,6 +32,13 @@ This can be done sourcing the init.sh file, which is generated in the build dire
 > source init.sh
 ```
 
+Python Module
+-------------
+Python module can be installed for Linux and Windows and python versions 3.7-3.9 using pip:
+```
+pip install pycatima
+```
+
 cmake options
 -------------
 compile options, enable or disable with cmake:
diff --git a/docs/README.md b/docs/README.md
index 0821371..071a2d8 100644
--- a/docs/README.md
+++ b/docs/README.md
@@ -18,6 +18,12 @@ This can be done sourcing the init.sh file, which is generated in the build dire
 source init.sh
 ```
 
+Python Module
+-------------
+Python module can be installed also using pip:
+```
+pip install pycatima
+```
 
 cmake options
 -------------
diff --git a/docs/pycatima.md b/docs/pycatima.md
index ba4f2cf..24b9f6f 100644
--- a/docs/pycatima.md
+++ b/docs/pycatima.md
@@ -1,5 +1,13 @@
 Usage
 =====
+Installation
+------------
+Easiest way is to install pycatima on Linux and Windows is using pip:
+```
+pip install pycatima
+```
+note: python 3.7-3.9 is required
+
 
 Pojectile
 ---------
@@ -158,7 +166,7 @@ __Results__ class stores results for 1 layer of __Material__. It has following v
   * dEdxo - Stopping power at exit
   * range - range in the material in g/cm^2
   * sigma_E - Energy straggling in MeV/u
-  * sigma_a - Angular straggling in MeV/u
+  * sigma_a - Angular straggling in rad
   * sigma_r - range straggling in g/cm^2
   * sigma_x - position straggling in cm
   * sp - non-reaction probability