diff --git a/README.md b/README.md
index f9e6b43..f69b0ea 100644
--- a/README.md
+++ b/README.md
@@ -29,7 +29,7 @@ Usage:
     -g         : list GPU temperatures (Celsius)
     -h         : help
     -l         : list all keys and values
-    -f         : fail-soft mode to store recent valid sensor value
+    -f         : fail-soft mode: If a valid sensor value cannot be retrieved, the most recent valid sensor value will be displayed
     -v         : version
     -n         : tries to query the temperature sensors for n times (e.g. -n3) (1 second interval) until a valid value is returned
 
diff --git a/main.cc b/main.cc
index d325d47..d4bbf76 100644
--- a/main.cc
+++ b/main.cc
@@ -12,7 +12,7 @@ void usage(char* prog) {
   std::cout << "    -g         : list GPU temperatures (Celsius)" << std::endl;
   std::cout << "    -h         : help" << std::endl;
   std::cout << "    -l         : list all keys and values" << std::endl;
-  std::cout << "    -f         : fail-soft mode to store recent valid sensor value" << std::endl;
+  std::cout << "    -f         : fail-soft mode: If a valid sensor value cannot be retrieved, the most recent valid sensor value will be displayed" << std::endl;
   std::cout << "    -v         : version" << std::endl;
   std::cout << "    -n         : tries to query the temperature sensors for n times (e.g. -n3)";
   std::cout << " (1 second interval) until a valid value is returned" << std::endl;