diff --git a/roof garden.md b/roof garden.md
index feb31f579..6c1c1914a 100644
--- a/roof garden.md	
+++ b/roof garden.md	
@@ -19,4 +19,4 @@
 			- [[raised flowers]]
 			- [[climbing plants]]
 	- "a vast part of the earth's surface, in a town, consists of roofs. couple this with the fact that the total area of a town which can be exposed to the sun is finite, and you will realize that it is natural, and indeed essential, to make roofs which take advantage of the sun and air."
-	- 
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+	- "as we know fromk [[sheltering roof]] and [[roof vaults]], the flat shape is quite unnatural for roofs from psychological, structural and climatic points of view"
\ No newline at end of file