diff --git a/src/mfoc.1 b/src/mfoc.1
index f59d0eb..2baa88f 100644
--- a/src/mfoc.1
+++ b/src/mfoc.1
@@ -25,6 +25,9 @@ Show summary of options.
 \fB\-k\fP \fIKEY\fR
 Initially try KEY in addition to the default keys.
 .TP
+\fB\-K\fP \fIKEY\fR
+Initially try KEY without the default keys.
+.T
 \fB\-O\fP \fIFILE\fR
 Dump card contents to FILE.
 .TP
diff --git a/src/mfoc.c b/src/mfoc.c
index 24aba8e..5c0e312 100644
--- a/src/mfoc.c
+++ b/src/mfoc.c
@@ -767,7 +767,9 @@ void usage(FILE *stream, int errno)
   fprintf(stream, "  h     print this help and exit\n");
 //    fprintf(stream, "  B     instead of 'A' dump 'B' keys\n");
   fprintf(stream, "  k     try the specified key in addition to the default keys\n");
+  fprintf(stream, "  K     Like -k option but without the default keys\n");
   fprintf(stream, "  f     parses a file of keys to add in addition to the default keys \n");    
+  fprintf(stream, "  F     Like -f option but without the default keys \n");    
 //    fprintf(stream, "  D     number of distance probes, default is 20\n");
 //    fprintf(stream, "  S     number of sets with keystreams, default is 5\n");
   fprintf(stream, "  P     number of probes per sector, instead of default of 20\n");