diff --git a/archival/gzip.c b/archival/gzip.c
index f9bb3c742..8f1e4ff29 100644
--- a/archival/gzip.c
+++ b/archival/gzip.c
@@ -77,13 +77,15 @@ aa:      85.1% -- replaced with aa.gz
 //kbuild:lib-$(CONFIG_GZIP) += gzip.o
 
 //usage:#define gzip_trivial_usage
-//usage:       "[-cfd" IF_FEATURE_GZIP_LEVELS("123456789") "] [FILE]..."
+//usage:       "[-cf" IF_GUNZIP("d") IF_FEATURE_GZIP_LEVELS("123456789") "] [FILE]..."
 //usage:#define gzip_full_usage "\n\n"
 //usage:       "Compress FILEs (or stdin)\n"
 //usage:	IF_FEATURE_GZIP_LEVELS(
 //usage:     "\n	-1..9	Compression level"
 //usage:	)
+//usage:	IF_GUNZIP(
 //usage:     "\n	-d	Decompress"
+//usage:	)
 //usage:     "\n	-c	Write to stdout"
 //usage:     "\n	-f	Force"
 //usage:
diff --git a/testsuite/tar.tests b/testsuite/tar.tests
index e9021662e..f19a53da2 100755
--- a/testsuite/tar.tests
+++ b/testsuite/tar.tests
@@ -24,7 +24,7 @@ tar: short read
 "" ""
 SKIP=
 
-optional FEATURE_SEAMLESS_GZ
+optional FEATURE_SEAMLESS_GZ GUNZIP
 # In NOMMU case, "invalid magic" message comes from gunzip child process.
 # Otherwise, it comes from tar.
 # Need to fix output up to avoid false positive.