diff --git a/Hardware_developement/4-HV/2-Audio/Readme.txt b/Hardware_developement/4-HV/2-Audio/Readme.txt
index 745d1c3..276bb39 100644
--- a/Hardware_developement/4-HV/2-Audio/Readme.txt
+++ b/Hardware_developement/4-HV/2-Audio/Readme.txt
@@ -1 +1 @@
-We are considering two possible solutions for audio excitation for high-voltage generator. 
\ No newline at end of file
+We are considering three possible solutions for audio excitation for high-voltage generator. The two of them are custom design and the third option is a stand-alone audio amplifier. 
\ No newline at end of file