diff --git a/pmbus.hpp b/pmbus.hpp
index bbe32e4..9254fe7 100644
--- a/pmbus.hpp
+++ b/pmbus.hpp
@@ -11,7 +11,9 @@
 
 namespace fs = std::experimental::filesystem;
 
+// The file name Linux uses to capture the STATUS_WORD from pmbus.
 constexpr auto STATUS_WORD = "status0";
+
 // The file name Linux uses to capture the VIN_UV_FAULT bit from the STATUS_WORD
 constexpr auto VIN_UV_FAULT = "in1_alarm";