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-rw-r--r--doc/apps/config.pod3
1 files changed, 2 insertions, 1 deletions
diff --git a/doc/apps/config.pod b/doc/apps/config.pod
index e12591528c0c..3f607d3b5fc8 100644
--- a/doc/apps/config.pod
+++ b/doc/apps/config.pod
@@ -47,7 +47,8 @@ or B<${section::name}>. By using the form B<$ENV::name> environment
variables can be substituted. It is also possible to assign values to
environment variables by using the name B<ENV::name>, this will work
if the program looks up environment variables using the B<CONF> library
-instead of calling B<getenv()> directly.
+instead of calling B<getenv()> directly. The value string must not exceed 64k in
+length after variable expansion. Otherwise an error will occur.
It is possible to escape certain characters by using any kind of quote
or the B<\> character. By making the last character of a line a B<\>