diff --git a/+stdlib/is_absolute.m b/+stdlib/is_absolute.m
index 03605d7..c9e7559 100644
--- a/+stdlib/is_absolute.m
+++ b/+stdlib/is_absolute.m
@@ -1,10 +1,12 @@
 function isabs = is_absolute(p)
+%% IS_ABSOLUTE
+% is path absolute?
+%
+% https://docs.oracle.com/en/java/javase/22/docs/api/java.base/java/io/File.html#isAbsolute()
 arguments
   p (1,1) string
 end
 
 isabs = java.io.File(p).toPath().isAbsolute();
 
-% alternative
-% https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/io/File.html#isAbsolute()
 end
diff --git a/+stdlib/is_writable.m b/+stdlib/is_writable.m
index cc98f04..1dceb24 100644
--- a/+stdlib/is_writable.m
+++ b/+stdlib/is_writable.m
@@ -1,6 +1,7 @@
 function ok = is_writable(file)
-%% is_writable is file writable
-% https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/nio/file/Files.html#isWritable(java.nio.file.Path)
+%% is_writable
+% is path writable
+% https://docs.oracle.com/en/java/javase/22/docs/api/java.base/java/nio/file/Files.html#isWritable(java.nio.file.Path)
 
 arguments
   file (1,1) string
diff --git a/Readme.md b/Readme.md
index eb19e5c..8cd6c2f 100644
--- a/Readme.md
+++ b/Readme.md
@@ -24,6 +24,10 @@ The "matlab-stdlib" package uses Java functions throughout, with the higher-leve
 and the classic
 [java.io.File](https://docs.oracle.com/en/java/javase/22/docs/api/java.base/java/io/File.html) classes.
 
+That is, if Matlab was started with
+[-nojvm](https://www.mathworks.com/help/matlab/matlab_env/commonly-used-startup-options.html),
+many of the stdlib filesystem function do not work.
+
 ## Acknowledgements
 
 Stdlib for Matlab was partly funded by NASA NNH19ZDA001N-HDEE grant 80NSSC20K0176.