diff --git a/Hardware_developement/4-HV/2-Audio/Readme.txt b/Hardware_developement/4-HV/2-Audio/Readme.txt
index 276bb39..c55d362 100644
--- a/Hardware_developement/4-HV/2-Audio/Readme.txt
+++ b/Hardware_developement/4-HV/2-Audio/Readme.txt
@@ -1 +1 @@
-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. 
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+We are considering three possible solutions for audio excitation for high-voltage generator. The two of them are custom design (one is based on LM4755 audio amplifier chip, and the other is based on LM4950 audio amplifier chip), whiled the third option is a stand-alone audio amplifier. 
\ No newline at end of file