diff --git a/lectures/revealjs/07-lecture-documentation.adoc b/lectures/revealjs/07-lecture-documentation.adoc
index 65011db222b1f41da2c590c2e3c936b4910aafd3..5591e3a812882a6941fd5c799432d08c413a5453 100644
--- a/lectures/revealjs/07-lecture-documentation.adoc
+++ b/lectures/revealjs/07-lecture-documentation.adoc
@@ -190,6 +190,7 @@ LatLong *--> "1" MetaData: "metaData"
 
 == Basic principles
 
+[.smaller-80]
 - be consistent
 - limit the subject line to 50 characters
 - don't put a period at the end of the subject line