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diff --git a/README.md b/README.md
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--- a/README.md
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@@ -1,9 +1,18 @@
 Onetimebluh (Workbluhp in blogress!!)
 ======================================
 
-Simple implementation of One Time Pad cipher.
+Simple implementation of One Time Pad cipher. 
 Capable of generating cryptographically strong random number keys and of usign them to encrypt/decrypt messages of same length with a bitwise XOR function.
 
+Build
+-------
+
+Still usign just gcc. Compile only for testing. Openssl libraries are needed and must be linked to gcc with the option `-lcrypto`. Here follows an example:
+
+```
+gcc -Wall -Wpedantic -lcrypto onetimebluh.c -o onetimebluh -v
+```
+
 Usage
 -------