diff --git a/README.md b/README.md
index e80200a..5407870 100644
--- a/README.md
+++ b/README.md
@@ -16,7 +16,8 @@ Usage: $0 [-adhrspvzZ] imagefile.img [newimagefile.img]
   -z         Compress image after shrinking with gzip
   -Z         Compress image after shrinking with xz
   -a         Compress image in parallel using multiple cores
-  -p         Remove logs, apt archives, dhcp leases and ssh hostkeys
+  -p         Remove logs, apt archives, dhcp leases
+  -P         Remove logs, apt archives, dhcp leases and ssh hostkeys
   -d         Write debug messages in a debug log file
 ```
 
@@ -28,6 +29,8 @@ If you specify the `newimagefile.img` parameter, the script will make a copy of
 * `-z` will compress the image after shrinking using gzip. `.gz` extension will be added to the filename.
 * `-Z` will compress the image after shrinking using xz. `.xz` extension will be added to the filename.
 * `-a` will use option -f9 for pigz and option -T0 for xz and compress in parallel.
+* `-p` will remove temp files, logs, apt archives, dhcp leases (but no longer removes hostkeys as in previous version)
+* `-P` will remove temp files, logs, apt archives, dhcp leases and hostkeys (beware: this prevents ssh login)
 * `-d` will create a logfile `pishrink.log` which may help for problem analysis.
 
 Default options for compressors can be overwritten by defining PISHRINK_GZIP or PSHRINK_XZ environment variables for gzip and xz.