diff --git a/include/usage.h b/include/usage.h
index 9ecdd9f24..2e65c6f45 100644
--- a/include/usage.h
+++ b/include/usage.h
@@ -628,10 +628,10 @@
 	"-rw-rw-r--    1 andersen andersen  1761280 Apr 14 17:47 /tmp/BusyBox-0.43.tar\n"
 
 #define gzip_trivial_usage \
-	"[OPTION]... FILE"
+	"[OPTION]... [FILE]"
 #define gzip_full_usage \
 	"Compress FILE with maximum compression.\n" \
-	"When FILE is '-', reads standard input.  Implies -c.\n\n" \
+	"When FILE is '-' or unspecified, reads standard input.  Implies -c.\n\n" \
 	"Options:\n" \
 	"\t-c\tWrite output to standard output instead of FILE.gz\n" \
 	"\t-d\tdecompress"