diff --git a/bindings/ruby/README.md b/bindings/ruby/README.md
index b8210b1e..07b81830 100644
--- a/bindings/ruby/README.md
+++ b/bindings/ruby/README.md
@@ -360,7 +360,7 @@ Whisper::Context.new("base")
 
 ### Low-level API to transcribe ###
 
-You can also call `Whisper::Context#full` and `#full_parallel` with a Ruby array as samples. Although `#transcribe` with audio file path is recommended because it extracts PCM samples in C++ and is fast, `#full` and `#full_parallel` give you flexibility.
+You can also call `Whisper::Context#full` and `#full_parallel` with a Ruby array as samples. Although `#transcribe` with audio file path is recommended because it extracts PCM samples in C++ and is fast, `#full` and `#full_parallel` give you flexibility. Unlike `#transcribe`, these methods requires 16,000 Hz, 32-bit float audio.
 
 ```ruby
 require "whisper"