diff --git a/Mount.md b/Mount.md
index 0f88294..56584c1 100644
--- a/Mount.md
+++ b/Mount.md
@@ -158,6 +158,8 @@ Threads fairness:
 
 ```
 
+## Common Problems ##
+
 ### Unmount ###
 
 Sometimes `weed mount` can not start if the last mount process was not cleaned up.
@@ -176,3 +178,6 @@ sudo umount -f /the/mounted/dir
 sudo umount -l /the/mounted/dir
 
 ```
+### Still fail to mount on MacOS ###
+From https://github.com/osxfuse/osxfuse/issues/358
+> FUSE needs to register a virtual device for exchanging messages between the kernel and the actual file system implementation running in user space. The number of available device slots is limited by macOS. So if you are using other software like VMware, VirtualBox, TunTap, Intel HAXM, ..., that eat up all free device slots, FUSE will not be able to register its virtual device.