diff --git a/programs/zstdcli.c b/programs/zstdcli.c
index ad473e33..ae8c9cba 100644
--- a/programs/zstdcli.c
+++ b/programs/zstdcli.c
@@ -561,7 +561,7 @@ int main(int argCount, const char* argv[])
                         continue;
                     }
                     if (longCommandWArg(&argument, "--fast")) {
-                        /* Parse optional window log */
+                        /* Parse optional acceleration factor */
                         if (*argument == '=') {
                             U32 fastLevel;
                             ++argument;
diff --git a/tests/playTests.sh b/tests/playTests.sh
index 9f30f29e..09a7377f 100755
--- a/tests/playTests.sh
+++ b/tests/playTests.sh
@@ -108,7 +108,7 @@ $ECHO "test : --fast aka negative compression levels"
 $ZSTD --fast -f tmp  # == -1
 $ZSTD --fast=3 -f tmp  # == -3
 $ZSTD --fast=200000 -f tmp  # == no compression
-! $ZSTD -c --fast=0  tmp # should fail
+! $ZSTD -c --fast=0 tmp > $INTOVOID # should fail
 $ECHO "test : too large numeric argument"
 $ZSTD --fast=9999999999 -f tmp  && die "should have refused numeric value"
 $ECHO "test : compress to stdout"