diff --git a/Hardware_development/3-Controllers/ESD_testing/ESD_testing.pdf b/Hardware_development/3-Controllers/ESD_testing/ESD_testing.pdf
index 8a7907e..d3d87c1 100644
Binary files a/Hardware_development/3-Controllers/ESD_testing/ESD_testing.pdf and b/Hardware_development/3-Controllers/ESD_testing/ESD_testing.pdf differ
diff --git a/Hardware_development/3-Controllers/ESD_testing/Readme.txt b/Hardware_development/3-Controllers/ESD_testing/Readme.txt
index 0e805aa..57b3025 100644
--- a/Hardware_development/3-Controllers/ESD_testing/Readme.txt
+++ b/Hardware_development/3-Controllers/ESD_testing/Readme.txt
@@ -20,4 +20,4 @@ Results are summarized in ESD_testing.pdf.
 
 Photos of tests can be found in the folder ./Photos/.
 
-Software for each tested microcontroller is available in the folder ./Software/. For every tested microcontroller there is a separate subfolder with the software used during the testing. For the cases where only the microcontroller code is given it can be fond in TXT file. For the cases where the project is given all of the project files can be found in ZIP file. Accompanying Readme.txt file briefly points to the software development environment. 
+Software for each tested microcontroller is available in the folder ./Software/. For every tested microcontroller there is a separate subfolder with the software used during the testing. For the cases where only the microcontroller code is given it can be found in TXT file. For the cases where the project is given all of the project files can be found in ZIP file. Accompanying Readme.txt file briefly points to the software development environment. 
diff --git a/Hardware_development/4-HV/Trafos/Readme.txt b/Hardware_development/4-HV/Trafos/Readme.txt
index ea57d06..22df77e 100644
--- a/Hardware_development/4-HV/Trafos/Readme.txt
+++ b/Hardware_development/4-HV/Trafos/Readme.txt
@@ -1,4 +1,4 @@
-We are investigaing trafos that can be bought as well as the DIY trafos. See the photos of all the tested trafos so far. 
+We are investigating trafos that can be bought as well as the DIY trafos. See the photos of all the tested trafos so far. 
 
 Currently considered trafos are
 
diff --git a/Software_development/Readme.txt b/Software_development/Readme.txt
index 6f38cca..3c9f2a8 100644
--- a/Software_development/Readme.txt
+++ b/Software_development/Readme.txt
@@ -2,7 +2,7 @@ This folder contains codes for O-ESD microcontroller(s) that orchestrate all fun
 
 Due to the ESD tests, the Arduino Nano & Arduino Nano Every are selected as microcontrollers. Hence, the code is for Arduino Nano family of microcontrollers. 
 
-The currently used code in O-ESD prototypes can be found in Code.ino. Note that only functionalities used up to this moment are coded, while the place-holders are put for additional functionalities that are planed. This code is under development and will change. 
+The currently used code in O-ESD prototypes can be found in Code.ino. Note that only functionalities used up to this moment are coded, while the place-holders are put for additional functionalities that are planned. This code is under development and will change. 
 
 Additionally, the code for synthesis of pulse trains of precise frequency can be found in Registers.ino. It is primarily used to test prototypes.