Index: doc/building.md
===================================================================
diff -u -N -r91cf2210f6440d85c8a488c1bd18b0d3feb93f19 -r2d41cbfe3c25373256501a298b98c25f774aa72b
--- doc/building.md	(.../building.md)	(revision 91cf2210f6440d85c8a488c1bd18b0d3feb93f19)
+++ doc/building.md	(.../building.md)	(revision 2d41cbfe3c25373256501a298b98c25f774aa72b)
@@ -26,7 +26,7 @@
 The method here is described in terms of using a command line.  You can easily do this on linux or in a Terminal window in macOS.  You can do it in Windows.
 
 * Java 11 compliant JDK
-* gradle 5.2 or above
+* gradle 5.2 or above *(NB gradle 6.6 and above currently produces NullPointerExceptions during the build. This is non-fatal and does not affect the build. Use gradle 6.5.1 to avoid this)*
 * git
 
 > The versions and installation methods here are just suggestions (which we have tested 
@@ -536,7 +536,7 @@
 in our preferred style.  We also support running the Jalview application, debugging 
 and running tests with TestNG from within Eclipse.
 
-To get Jalview set up as a project in Eclipse, we recommend using at least the 2019-12 
+To get Jalview set up as a project in Eclipse, we recommend using at least the 2020-03
 version of Eclipse IDE for Java Developers which you can download from the Eclipse 
 website: <https://www.eclipse.org/downloads/>.  Since Eclipse 2020-03 you are encouraged to use the Eclipse Installer (see the Eclipse Downloads page).
 In the installer, when given a choice of packages for Eclipse you should choose the "Eclipse IDE for Enterprise Java Developers" package.
@@ -560,7 +560,7 @@
 1. TestNG for Eclipse (optional -- only needed if you want to run tests from Eclipse)
 
 > At time of writing, TestNG for Eclipse does not show up in the Eclipse Marketplace 
-as the latest released version does not install in Eclipse 2019-03.
+as the latest released version does not install in Eclipse 2020-03.
 However, you can install a working release of TestNG for Eclipse by going to
 >
 > Help->Install New Software...
@@ -600,6 +600,14 @@
 
 If you have already downloaded Jalview using `git clone` then you can import this folder into Eclipse directly.
 
+__Before importing the cloned git repo you must create the Eclipse project files.__ You can do this by either running
+
+`gradle eclipse`
+
+or
+
+Unzipping the file `utils/eclipse/eclipse_startup_files.zip` in the base repo directory (`jalview`)
+
 It is important to import 
 Jalview as a Gradle project (not as a Java project), so go to