diff --git a/The-OBITools3-syntax.md b/The-OBITools3-syntax.md
index fafd420..584832e 100644
--- a/The-OBITools3-syntax.md
+++ b/The-OBITools3-syntax.md
@@ -12,6 +12,8 @@
 	
 	Any hybrid of those 2 works too.
 
+* The `-` URI can be used to write the result of a command to standard output.
+
 * View names must be unique within a DMS, in other words, views can not be overwritten.
 
 * All tools accept different input and output DMS.