--- a/relpipe-data/principles.xml	Mon Dec 10 22:14:04 2018 +0100
+++ b/relpipe-data/principles.xml	Wed Dec 12 23:27:45 2018 +0100
@@ -135,7 +135,7 @@
 		<p>
 			However, there are cases where such streaming is not feasible e.g. if we need to compute some statistics or a column widths while printing a table in the terminal.
 			In such situation, we must read the whole relation and only then generate the output.
-			But we should still be able to do streaming on the relations level e.i. if there are more relation, we always hold only one of them in the memory.
+			But we should still be able to do streaming on the relations level i.e. if there are more relation, we always hold only one of them in the memory.
 		</p>
 		
 		<p>