diff --git a/lib/linguist/documentation.yml b/lib/linguist/documentation.yml
index 21710b03..99cfe382 100644
--- a/lib/linguist/documentation.yml
+++ b/lib/linguist/documentation.yml
@@ -9,11 +9,12 @@
 
 ## Documentation directories ##
 
-- ^docs?/
+- ^[Dd]ocs?/
 - (^|/)[Dd]ocumentation/
-- (^|/)javadoc/
-- ^man/
+- (^|/)[Jj]avadoc/
+- ^[Mm]an/
 - ^[Ee]xamples/
+- ^[Dd]emos?/
 
 ## Documentation files ##