diff --git a/tests/fuzzer.c b/tests/fuzzer.c
index 3c4aac7a8..1b47a19e2 100644
--- a/tests/fuzzer.c
+++ b/tests/fuzzer.c
@@ -2833,7 +2833,8 @@ static int FUZ_usage(const char* programName)
     DISPLAY( "      %s [args]\n", programName);
     DISPLAY( "\n");
     DISPLAY( "Arguments :\n");
-    DISPLAY( " -i#    : Nb of tests (default:%i) \n", nbTestsDefault);
+    DISPLAY( " -i#    : Number of tests (default:%i)\n", nbTestsDefault);
+    DISPLAY( " -T#    : Max duration to run for. Overrides number of tests. (e.g. -T1m or -T60s for one minute)\n");
     DISPLAY( " -s#    : Select seed (default:prompt user)\n");
     DISPLAY( " -t#    : Select starting test number (default:0)\n");
     DISPLAY( " -P#    : Select compressibility in %% (default:%i%%)\n", FUZ_compressibility_default);
diff --git a/tests/zstreamtest.c b/tests/zstreamtest.c
index 890e66f9e..26a1d1a47 100644
--- a/tests/zstreamtest.c
+++ b/tests/zstreamtest.c
@@ -2373,7 +2373,8 @@ static int FUZ_usage(const char* programName)
     DISPLAY( "      %s [args]\n", programName);
     DISPLAY( "\n");
     DISPLAY( "Arguments :\n");
-    DISPLAY( " -i#    : Nb of tests (default:%u) \n", nbTestsDefault);
+    DISPLAY( " -i#    : Number of tests (default:%u)\n", nbTestsDefault);
+    DISPLAY( " -T#    : Max duration to run for. Overrides number of tests. (e.g. -T1m or -T60s for one minute)\n");
     DISPLAY( " -s#    : Select seed (default:prompt user)\n");
     DISPLAY( " -t#    : Select starting test number (default:0)\n");
     DISPLAY( " -P#    : Select compressibility in %% (default:%i%%)\n", FUZ_COMPRESSIBILITY_DEFAULT);