diff --git a/wch-isp.man b/wch-isp.man
index 7c18205..7afd792 100644
--- a/wch-isp.man
+++ b/wch-isp.man
@@ -22,13 +22,13 @@ Prints a progress during command operation.
 Reset the microcontroller after the command is completed.
 .TP
 .B \-b
-Do not read database
+Do not read database.
 .TP
 .B \-f
-Ignore if firmware size more than cached flash size (program memory)
+Ignore if firmware size more than cached flash size (program memory).
 .TP
 .B \-F
-Ignore if firmware size more than total flash size (program memory + const data memory)
+Ignore if firmware size more than total flash size (program memory + const data memory).
 .TP
 .B \-d
 Enable debug information, print raw isp commands sent over USB or COM-port.
@@ -39,24 +39,31 @@ Prints version information to stdout, then exits.
 .B \-h, --help
 Prints help message to stdout, then exits.
 .TP
-.BI \--port= "PORT [baudrate]"
-Specify port to connect the device. It may be 'USB' or '/dev/ttyUSB0' or '//./COM2' or something else
+.BI \--port= "port [baudrate]"
+Specify \fIport\fR to connect the device. It may be \fBUSB\fR or \fB/dev/ttyUSB0\fR or \fB//./COM2\fR or something else.
 .TP
-.BI \--device= DEV
-Test if connected device is DEV and exit if they differ. <DEV> may be read by 'info' option.
-Example: --device=CH32V203G8R6
+.BI \--device= dev
+Test if connected device is \fIdev\fR and exit if they differ. \fIdev\fR may be read by \fBinfo\fR option.
+.RB Example:\  --device=CH32V203G8R6
 .TP
 .BI \--uid= uid
-Select the microcontroller that matches the uid.
+Select the microcontroller that matches the \fIuid\fR.
 .TP
-.BI \--reset= pin
-Specify COM-port control pin as RESET signal. May be RTS, DTR, nRTS or nDTR
+.BI \--reset= number
+Specify COM-port control pin \fInumber\fR as RESET signal. May be
+.BR RTS ,\  DTR ,\  nRTS\  or\  nDTR .
 .TP
-.BI \--boot0= pin
-Specify COM-port control pin as Boot0 signal. May be RTS, DTR, nRTS or nDTR
+.BI \--boot0= number
+Specify COM-port control pin \fInumber\fR as Boot0 signal. May be 
+.BR RTS ,\  DTR ,\  nRTS\  or\  nDTR .
 .TP
 .BI \--address= addr 
-Start writing from addr
+Start writing from
+.IR addr .
+.TP
+.BI \--database-path= directory
+Search device info in specified
+.IR directory .
 .SH COMMANDS
 .TP
 .B list
@@ -76,17 +83,18 @@ content against the flash content.
 Erase all the flash content (not implemented yet).
 .TP
 .B unlock
-Disable flash write protection (modifies the chip configuration) (not implemented yet)
+Disable flash write protection (modifies the chip configuration) (not implemented yet).
 .TP
 .B info
 Print a device information and memory dump of the chip configuration.
 .TP
 .BI optionbytes " 'CMD'"
-change optionbytes
- example: ./wch-isp optionbytes 'RDPR=0xA5, DATA0 = 0x42'
+Change optionbytes. 
+ Example:
+.B ./wch-isp optionbytes 'RDPR=0xA5, DATA0 = 0x42'
 .TP
 .BI optionshow " 'CMD'"
-show changes after apply CMD to optionbytes; Do not write
+Show changes after applying \fICMD\fR to optionbytes; do not write.
 .SH EXAMPLES
 .PP
 List detected devices: