diff --git a/src/internal_modules/roc_audio/sample_spec.h b/src/internal_modules/roc_audio/sample_spec.h
index 8ef737302..05b4f3568 100644
--- a/src/internal_modules/roc_audio/sample_spec.h
+++ b/src/internal_modules/roc_audio/sample_spec.h
@@ -65,7 +65,8 @@ class SampleSpec {
 
     //! Check if sample spec has non-zero rate and valid channel set.
     bool is_valid() const;
-
+    
+    //! Check if sample spec has a zero rate, empty channel set, and invalid_format
     bool is_empty() const;
 
     //! Check if samples are in raw format.