diff --git a/doc/java.md b/doc/java.md
index 09c42f7..ae8fd73 100644
--- a/doc/java.md
+++ b/doc/java.md
@@ -2,19 +2,25 @@
 
 * download OpenJDK from the [Eclipse Foundation](https://adoptium.net/)
 
+* download JDK 17
+```
+wget https://github.com/adoptium/temurin17-binaries/releases/download/jdk-17.0.10%2B7/OpenJDK17U-jdk_x64_linux_hotspot_17.0.10_7.tar.gz
+```
+
 * extract JDK to target folder\
 NOTE: Create target folder in advance
 ```
-sudo mkdir -p /usr/lib/jvm/open-jdk-17 --
-sudo tar -xvzf ./OpenJDK17U-jdk_x64_linux_hotspot_17.0.2_8.tar.gz -C /usr/lib/jvm/open-jdk-17 --strip-components=1
+sudo mkdir -p /usr/lib/jvm/open-jdk-17
+sudo tar -xzf ./OpenJDK17U-jdk_x64_linux_hotspot_17.<version>.tar.gz -C /usr/lib/jvm/open-jdk-17 --strip-components=1
 sudo mkdir -p /usr/lib/jvm/open-jdk-11 --
-sudo tar -xvzf ./OpenJDK11U-jdk_x64_linux_hotspot_11.0.14.1_1.tar.gz -C /usr/lib/jvm/open-jdk-11/ --strip-components=1
+sudo tar -xzf ./OpenJDK11U-jdk_x64_linux_hotspot_11.<version>.tar.gz -C /usr/lib/jvm/open-jdk-11/ --strip-components=1
 ```
 
 * check if any JDK is already installed
 ```
 java -version
 update-alternatives --list java
+sudo update-alternatives --display java
 ```
 
 * install JDK 17
@@ -36,6 +42,9 @@ sudo update-alternatives --install /usr/bin/jshell jshell /usr/lib/jvm/open-jdk-
 * chose JDK version
 ```
 sudo update-alternatives --config java
+sudo update-alternatives --config javac
+sudo update-alternatives --config jar
+sudo update-alternatives --config jshell
 ```
 
 * verify installation and configuratin
diff --git a/doc/postgres-install.md b/doc/postgres-install.md
index 6f4b5fa..e678706 100644
--- a/doc/postgres-install.md
+++ b/doc/postgres-install.md
@@ -2,6 +2,7 @@
 
 * get the latest version of installed packages and refresh the repo cache
 ```
+ssh user@host
 sudo apt update
 ```
 
@@ -20,4 +21,6 @@ cat /etc/group|grep postgres
 ```
 sudo -u postgres psql
 postgres=# \password postgres
+\q
+exit
 ```
diff --git a/doc/postgres-upgrade-pg_upgradecluster.md b/doc/postgres-upgrade-pg_upgradecluster.md
index 42bfcda..d922976 100644
--- a/doc/postgres-upgrade-pg_upgradecluster.md
+++ b/doc/postgres-upgrade-pg_upgradecluster.md
@@ -13,13 +13,13 @@ sudo apt upgrade postgresql-xy
 
 * install relevant packages
 ```
-sudo apt-get install postgresql-server-dev-13
+sudo apt-get install postgresql-server-dev-xy
 ```
 
 * make a backup
 ```
-cd
-time sudo -u postgres pg_dumpall > bckp-all-2023-08-07
+cd ~
+time sudo -u postgres pg_dumpall > ~/pg_dumpall-bckp-all-2023-08-07
 ```
 
 * check installed extensions on old version
@@ -30,11 +30,13 @@ sudo -u postgres psql -p 5432 postgres
 
 * OPTION: install extension on new version
 ```
-sudo apt install postgresql-13-postgis-3 --no-install-recommends
-sudo -u postgres psql -p 5433 postgres
+sudo apt install postgresql-xy-postgis-3 --no-install-recommends
+//OPTION: sudo -u postgres psql -p 5432 postgres
+//OPTION: sudo -u postgres psql -p 5433 postgres
 \dx
 CREATE EXTENSION postgis;
 CREATE EXTENSION hstore;
+\q
 ```
 
 * stop all clusters