diff --git a/README.md b/README.md
index cbd14eeb1f3030147b6e5d750b81ca427f32e1cb..dec115faa74208f562e7b66680b0efb43195f409 100644
--- a/README.md
+++ b/README.md
@@ -52,7 +52,7 @@ arc i create -i ARC_NAME
 arc investigation update --identifier "ARC_NAME" --title "TITEL" --description "DESCRIPTION"  
 ```
 
-## isa.investigation contact person(s) metadata  
+## isa.investigation contact person(s)'s metadata  
 
 ### Adding a contact person for the investigation - example
 
@@ -69,7 +69,7 @@ Of course, the ORCID iD of PERSON2 should be used here.
 arc i person register -l LASTNAME_PERSON2 -f FIRSTNAME_PERSON2 -m MIDNAME_PERSON2 --email person2@uniX.de --address "XXXXX CITY, COUNTRY" --affiliation "AFFILIATION_PERSON2" --roles "principal investigator; leads investigation; designs experiments; supervisor" --rolestermsourceref "SCORO; SCORO; SCORO; SCORO" --orcid "0000-0002-3879-7057"  
 ```
 
-## isa.investigation publication(s) metadata
+## isa.investigation publication(s)'s metadata
 
 ### Adding a publication - Example with placeholders and example ontology entries