diff --git a/doc/erko_howto_tools.txt b/doc/erko_howto_tools.txt
index c335ba76d965e0840bccc569db2ecf710485acd1..3ed059d97e5a7748d6f1734cfb07dab1772910f3 100755
--- a/doc/erko_howto_tools.txt
+++ b/doc/erko_howto_tools.txt
@@ -1,6 +1,7 @@
 * RadioHDL with GIT (LOFAR2.0)
 * Flash and reboot unb2
 * Flash and reboot on L2TS using tunnel to SDPTR
+* HDL images to keep on dop349
 * RadioHDL with SVN (APERTIF/ARTS)
 * RadioHDL issues
 * ARGS
@@ -441,6 +442,27 @@ node 17:  2023-09-16T18.27.54_4b45e10a4_lofar2_unb2c_sdp_station_full
 node 18:  2023-09-16T18.27.54_4b45e10a4_lofar2_unb2c_sdp_station_full
 node 19:  2023-09-16T18.27.54_4b45e10a4_lofar2_unb2c_sdp_station_full
 
+*******************************************************************************
+* HDL images to keep on dop349
+* . for lofar2_sdp and for disturb
+* . also keep '_wg' revision because used on ARTS-unb2b and for ring node in Disturb
+* . in /home/regtest/git/hdl/build_result
+*******************************************************************************
+
+regtest@dop349:~/git/hdl/build_result$ ls -lt |grep lofar2_unb2b
+drwxrwxr-x 8 regtest regtest 4096 Oct  8 00:07 2023-10-07T22u07_lofar2_unb2b_sdp_station_full_wg_215MHz
+drwxrwxr-x 8 regtest regtest 4096 Sep 17 00:06 2023-09-16T22u06_lofar2_unb2b_sdp_station_full_wg_205MHz
+drwxrwxr-x 8 regtest regtest 4096 Apr 15 23:29 2023-04-15T21u29_lofar2_unb2b_sdp_station_full_wg_211MHz
+drwxrwxr-x 8 regtest regtest 4096 Dec 25  2022 2022-12-25T17:01_lofar2_unb2b_sdp_station_full_wg_210MHz
+regtest@dop349:~/git/hdl/build_result$ ls -lt |grep lofar2_unb2c
+drwxrwxr-x 8 regtest regtest 4096 Oct  7 20:53 2023-10-07T18u53_lofar2_unb2c_sdp_station_full_192MHz
+drwxrwxr-x 8 regtest regtest 4096 Sep 16 20:54 2023-09-16T18u54_lofar2_unb2c_sdp_station_full_201MHz
+drwxrwxr-x 8 regtest regtest 4096 Apr 22 20:43 2023-04-22T18u43_lofar2_unb2c_sdp_station_full_201MHz  -- apr 15 was lost
+drwxrwxr-x 8 regtest regtest 4096 Dec 25  2022 2022-12-25T14:14_lofar2_unb2c_sdp_station_full_198MHz
+regtest@dop349:~/git/hdl/build_result$ df /home/
+Filesystem     1K-blocks      Used Available Use% Mounted on
+/dev/sda3      959783984 585934864 325021012  65% /
+
 *******************************************************************************
 * RadioHDL with SVN
 *******************************************************************************