diff --git a/config/galaxy.ini.sample b/config/galaxy.ini.sample
index aa319b22ba1..a9276c73f74 100644
--- a/config/galaxy.ini.sample
+++ b/config/galaxy.ini.sample
@@ -974,8 +974,9 @@ use_interactive = True
 #retry_metadata_internally = True
 
 # Very large metadata values can cause Galaxy crashes.  This will allow
-# limiting the maximum metadata size Galaxy will attempt to save with a
-# dataset.  0 to disable this feature.  5000000 is a reasonable size.
+# limiting the maximum metadata key size (in bytes used in memory, not the end
+# result database value size) Galaxy will attempt to save with a dataset.  0 to
+# disable this feature.  5000000 seems to be a reasonable size.
 #max_metadata_value_size = 0
 
 # If (for example) you run on a cluster and your datasets (by default,