1 files changed, 1 insertions, 0 deletions

diff --git a/README.md b/README.md
index 6357a3d..7a70a19 100644
--- a/README.md
+++ b/README.md
@@ -15,6 +15,7 @@ the first time `filter-branch` still requires some time, but following calls can
 
 - git 2.16.0 or newer
 - common commands (`sed`, `grep`, `md5sum`, `cut`, ...)
+- sufficient space in /dev/shm or a different location specified with `--tempdir` to run filters
 
 
 ## Usage