diff --git a/docs/source/building.rst b/docs/source/building.rst
index 3b87e6c9f..3352bb974 100644
--- a/docs/source/building.rst
+++ b/docs/source/building.rst
@@ -16,7 +16,7 @@ Then you can choose a few ways to get a compiler:
 #. download a recent "fat-jar" (called something like "prog8compiler-all.jar") from `the releases on Github <https://github.com/irmen/prog8/releases>`_
 #. run the compiler with "java -jar prog8compiler-all.jar" to see how you can use it.
 
-**using the Gradle build system to make it yourself:**
+**Using the Gradle build system to build it yourself:**
 
 The Gradle build system is used to build the compiler.
 The most interesting gradle commands to run are probably:
@@ -42,9 +42,10 @@ of that build task, you can start the compiler with:
 (You should probably make an alias...)
 
 .. hint::
-    Development and testing is done on Linux, but the compiler should run on most
-    operating systems. If you do have trouble building or running
-    the compiler on another operating system, please let me know!
+    Development and testing is done on Linux using the IntelliJ IDEA IDE,
+    but the compiler should run on most operating systems that provide a fairly modern
+    java runtime. If you do have trouble building or running the compiler on your
+    operating system, please let me know!
 
 
 
diff --git a/docs/source/conf.py b/docs/source/conf.py
index 89d7d53b3..fc85728f8 100644
--- a/docs/source/conf.py
+++ b/docs/source/conf.py
@@ -33,7 +33,7 @@ release = version
 
 def setup(app):
     # add custom css
-    app.add_stylesheet("css/customize.css")
+    app.add_css_file("css/customize.css")
 
 
 # -- General configuration ---------------------------------------------------
diff --git a/docs/source/index.rst b/docs/source/index.rst
index d0755517e..e4fcc846a 100644
--- a/docs/source/index.rst
+++ b/docs/source/index.rst
@@ -130,11 +130,18 @@ when the exact same program is compiled for the Commander X16 target, and run on
     :alt: result when run on CX16 emulator
 
 
+Getting the compiler
+--------------------
+
+Usually you just download a fat jar of an official released version, but you can also build
+it yourself from source.
+Detailed instructions on how to obtain a version of the compiler are in :ref:`building_compiler`.
+
 
 .. _requirements:
 
-Required tools
---------------
+Required additional tools
+-------------------------
 
 `64tass <https://sourceforge.net/projects/tass64/>`_ - cross assembler. Install this on your shell path.
 It's very easy to compile yourself.
@@ -153,16 +160,6 @@ If you're targeting the CommanderX16 instead, there's the `x16emu <https://githu
 Make sure you use cx16 emulator and roms **V39 or newer**! Starting from version 6.5, prog8 targets that system version.
 Your program may work on V38 but that will only be by luck.
 
-.. important::
-    **Building the compiler itself:** (*Only needed if you have not downloaded a pre-built 'fat-jar'*)
-
-    (Re)building the compiler itself requires a recent Kotlin SDK.
-    The compiler is developed using `IntelliJ IDEA <https://www.jetbrains.com/idea/>`_ ,
-    but only a Kotlin SDK installation should work as well, because the gradle tool is
-    used to compile everything from the commandline.
-
-    Instructions on how to obtain a prebuilt compiler are in :ref:`building_compiler`.
-
 
 .. toctree::
     :maxdepth: 2