diff --git a/development/autotests/unreliableTests b/development/autotests/unreliableTests
index 0b1efe25fe..63e146a943 100644
--- a/development/autotests/unreliableTests
+++ b/development/autotests/unreliableTests
@@ -56,14 +56,9 @@ export/doc/es/Customization_pdf4_texF
 
 Sublabel: varying_versions
 ##########################
-# Test depending on TeX distribution, package versions or OS.
-
-# document class aastex.cls replaced by aastex6.cls (v.1 2016/02/16)
-# in CTAN and TeXLive in march 2016
-# Template and sample use the new version via aastex6.layout (cf. #10027)
-# -> fail if aastex6.cls is missing (TeXLive15 original)
-export/templates/aastex_(dvi|pdf).*
-export/examples/aas_sample_(dvi|pdf).*
+# Test depending on e.g. OS or version of a non-TeX-Live dependency.
+# Note that a full, up-to-date TeX Live installation is required so this
+# sublabel is about versions of other dependencies.
 
 
 Sublabel: wrong_output
diff --git a/lib/doc/Development.lyx b/lib/doc/Development.lyx
index aafad741d1..58d0f8f5a9 100644
--- a/lib/doc/Development.lyx
+++ b/lib/doc/Development.lyx
@@ -3393,7 +3393,7 @@ If the export did not fail previously but led to wrong output (PDF, say),
 status collapsed
 
 \begin_layout Plain Layout
-Non-failing test with wrong output should be labeledas 
+Non-failing test with wrong output should be labeled as 
 \begin_inset Quotes eld
 \end_inset
 
@@ -3827,8 +3827,10 @@ erratic Tests depending on local configuration or the phase of the moon.
 \end_layout
 
 \begin_layout Description
-varying_versions Test depending on TeX distribution, package versions or
- OS.
+varying_versions Tests depending on e.g.
+ OS or version of a non-TeX-Live dependency.
+ Note that a full, up-to-date TeX Live installation is required so this
+ sublabel is about versions of other dependencies.
 \end_layout
 
 \begin_layout Description