diff --git a/script/test b/script/test
index d7897567..2c6c50e5 100755
--- a/script/test
+++ b/script/test
@@ -6,7 +6,7 @@ function usage {
   cat <<-EOF
 USAGE
 
-  $0  [-dghv] [-f focus-string]
+  $0  [-dgGhv] [-f focus-string]
 
 OPTIONS
 
@@ -14,7 +14,9 @@ OPTIONS
 
   -d  run tests in a debugger (either lldb or gdb)
 
-  -g  run tests with valgrind
+  -g  run tests with valgrind's memcheck tool
+
+  -G  run tests with valgrind's memcheck tool, including a full leak check
 
   -v  run tests with verbose output