diff --git a/compiler/src/prog8/CompilerMain.kt b/compiler/src/prog8/CompilerMain.kt
index d042ce51d..6e120aaed 100644
--- a/compiler/src/prog8/CompilerMain.kt
+++ b/compiler/src/prog8/CompilerMain.kt
@@ -19,6 +19,11 @@ import kotlin.system.exitProcess
 
 
 fun main(args: Array<String>) {
+
+    // NOTE: if your compiler/IDE complains here about "Unresolved reference: buildversion",
+    //       it means that you have to run the gradle task once to generate this file.
+    //       Do that with this command:  gradle createVersionFile
+
     println("\nProg8 compiler v${prog8.buildversion.VERSION} by Irmen de Jong (irmen@razorvine.net)")
     if('-' in prog8.buildversion.VERSION) {
         println("Prerelease version from git commit ${prog8.buildversion.GIT_SHA.take(8)} in branch ${prog8.buildversion.GIT_BRANCH}")
diff --git a/compiler/test/codegeneration/TestArrayThings.kt b/compiler/test/codegeneration/TestArrayThings.kt
index 03192ab9e..d146a7777 100644
--- a/compiler/test/codegeneration/TestArrayThings.kt
+++ b/compiler/test/codegeneration/TestArrayThings.kt
@@ -111,16 +111,23 @@ main {
   sub start() {
   }
 }"""
-        compileText(C64Target(), false, srcWrong1, writeAssembly = false) shouldBe null
+        val errors = ErrorReporterForTests()
+        compileText(C64Target(), false, srcWrong1, writeAssembly = false, errors=errors) shouldBe null
+        errors.errors.size shouldBe 1
+        errors.errors[0] shouldContain "split can only be used on word arrays"
 
         val srcWrong2 = """
+%option enable_floats
 main {
   float[10] @split sf
 
   sub start() {
   }
 }"""
-        compileText(C64Target(), false, srcWrong2, writeAssembly = false) shouldBe null
+        errors.clear()
+        compileText(C64Target(), false, srcWrong2, writeAssembly = false, errors=errors) shouldBe null
+        errors.errors.size shouldBe 1
+        errors.errors[0] shouldContain "split can only be used on word arrays"
     }
 
     test("split word arrays in asm as lsb/msb") {
diff --git a/docs/source/compiling.rst b/docs/source/compiling.rst
index aa5ae35cc..0c8597aa9 100644
--- a/docs/source/compiling.rst
+++ b/docs/source/compiling.rst
@@ -65,8 +65,12 @@ For normal use, the ``installDist`` task should suffice and after succesful comp
     but the actual prog8 compiler should run on all operating systems that provide a java runtime (version 11 or newer).
     If you do have trouble building or running the compiler on your operating system, please let me know!
 
-    To successfully build and debug in IDEA, you have to manually generate the Antlr-parser classes first.
-    The easiest way to do this is the following:
+    To successfully build and debug in IDEA, you have to do two things manually first:
+
+    1. you have to generate the buildversion file, do this with the shell command:   ``gradle createVersionFile``
+    2. manually generate the Antlr-parser classes first.
+
+    The easiest way to build the parser classes this is the following:
 
     1. make sure you have the Antlr4 plugin installed in IDEA
     2. right click the grammar file Prog8ANTLR.g4 in the parser project, and choose "Generate Antlr Recognizer" from the menu.