diff --git a/hadoop-common-project/hadoop-common/src/site/markdown/DownstreamDev.md b/hadoop-common-project/hadoop-common/src/site/markdown/DownstreamDev.md
index b04bc2488f8..e38dfc4c88b 100644
--- a/hadoop-common-project/hadoop-common/src/site/markdown/DownstreamDev.md
+++ b/hadoop-common-project/hadoop-common/src/site/markdown/DownstreamDev.md
@@ -300,7 +300,7 @@ that conflicts with a property defined by Hadoop can lead to unexpected and
 undesirable results. Users are encouraged to avoid using custom configuration
 property names that conflict with the namespace of Hadoop-defined properties
 and thus should avoid using any prefixes used by Hadoop,
-e.g. hadoop, io, ipc, fs, net, file, ftp, kfs, ha, file, dfs, mapred,
+e.g. hadoop, io, ipc, fs, net, ftp, ha, file, dfs, mapred,
 mapreduce, and yarn.
 
 ### Logging Configuration Files