diff --git a/README.md b/README.md
index 1d0f787..0e930cc 100644
--- a/README.md
+++ b/README.md
@@ -127,6 +127,7 @@ def generate_simple_pix(
     This creates a simple functional Pix object.
     These are the formats acceptable for keys:
         CPF     -> ###.###.###-##
+        CNPJ    -> ##.###.###/####-##
         Phone   -> (##) ####-#### / (##) #####-####
         Email   -> ###@###.###
         RandKey -> len(key) == 36