diff --git a/NEWS b/NEWS
index 036df007..ccbf15eb 100644
--- a/NEWS
+++ b/NEWS
@@ -1,7 +1,7 @@
 v0.5.1
 New : Optimal parsing => Very high compression modes, thanks to Przemyslaw Skibinski
 Changed : Dictionary builder integrated into libzstd and zstd cli
-Changed : zstd cli now uses "multiple input files" as default mode
+Changed (!) : zstd cli now uses "multiple input files" as default mode. See `zstd -h`.
 Fix : high compression modes for big-endian platforms
 New : zstd cli : `-t` | `--test` command
 
diff --git a/lib/zstd_compress.c b/lib/zstd_compress.c
index 389cf4f7..7bea6abe 100644
--- a/lib/zstd_compress.c
+++ b/lib/zstd_compress.c
@@ -2292,7 +2292,7 @@ static const ZSTD_parameters ZSTD_defaultParameters[4][ZSTD_MAX_CLEVEL+1] = {
     {  0, 23, 23, 23,  5,  5,  4, ZSTD_lazy2   },  /* level 15 */
     {  0, 23, 22, 22,  5,  5,  4, ZSTD_btlazy2 },  /* level 16 */
     {  0, 24, 24, 23,  4,  5,  4, ZSTD_btlazy2 },  /* level 17 */
-    {  0, 24, 25, 24,  4,  4, 24, ZSTD_btopt   },  /* level 18 */
+    {  0, 24, 24, 23,  5,  5, 30, ZSTD_btopt   },  /* level 18 */
     {  0, 25, 25, 24,  5,  4, 40, ZSTD_btopt   },  /* level 19 */
     {  0, 26, 26, 25,  8,  4,256, ZSTD_btopt   },  /* level 20 */
     {  0, 26, 27, 25, 10,  4,256, ZSTD_btopt   },  /* level 21 */