diff --git a/src/library/gnss/antex_file_reader.hpp b/src/library/gnss/antex_file_reader.hpp
index 8e27e0699..609abc7c8 100644
--- a/src/library/gnss/antex_file_reader.hpp
+++ b/src/library/gnss/antex_file_reader.hpp
@@ -114,6 +114,8 @@ class AntexPhaseCenterData {
    */
   ~AntexPhaseCenterData() {}
 
+  // TODO: Implement phase center variation calculation from the matrix
+
   // Setter
   /**
    * @fn SetFrequencyName