diff --git a/INSTALL b/INSTALL
index 2fe254c7..57479d0d 100644
--- a/INSTALL
+++ b/INSTALL
@@ -9,11 +9,16 @@ Requirements (tools, headers and libraries):
  * You need the expat XML parser (2.0.1 should work)
  * Python (for ladish_control and LADI Tools)
 
-Optional requirements, without them GUI frontend will not be built:
+For building the GTK2 frontend gladish (disabled by default),
+additional dependencies are:
+
  * You need glib-2.20.3 or later
  * You need dbus-glib-0.74 or later
  * You need gtk+-2.20.0 or later
 
+Note, gladish will not work with GTK3 (or GTK4).
+The Claudia frontend is alternative GUI in python that uses Qt.
+
 ===================================================
 
 = Configure it =
@@ -25,6 +30,10 @@ If you want to use other prefix, use --prefix option:
 
 ./waf configure --prefix=/usr
 
+If you want to build gladish as well:
+
+./waf configure --prefix=/usr --enable-gladish
+
 For full list of options, run:
 
 ./waf configure --help
@@ -33,7 +42,8 @@ For full list of options, run:
 
 ./waf
 
-You can use -j option to enable building on more than one CPU:
+By default, all available CPUs/cores will be used.
+To adjust the number, use -j option, e.g. for 4 jobs:
 
 ./waf -j 4
 
diff --git a/NEWS b/NEWS
index e2694460..2f7db273 100644
--- a/NEWS
+++ b/NEWS
@@ -4,6 +4,7 @@ Changes since 1.2:
 
  * Add verify-sig_waf.sh waf verification script from waf-2.0.27
  * Upgrade waf to 2.0.27
+ * Update INSTALL
 
 = Version 1.2 on 2023-03-29 =
 
diff --git a/waf b/waf
old mode 100644
new mode 100755