diff --git a/README.md b/README.md
index b994af7..ccc871e 100644
--- a/README.md
+++ b/README.md
@@ -118,3 +118,9 @@ Regular expression : `^[+]*[(]{0,1}[0-9]{1,4}[)]{0,1}[-\s\./0-9]*$`
 
 ### OSINT
 - https://osintframework.com/
+
+### Google hacking
+
+- `insubject:"+XXXXXXXXX" | insubject:"+XXXXX" | insubject:"XXXXX XXX XXX`
+- `insubject:"{number}" | intitle:"{number}"`
+- `intext:"{number}" ext:doc | ext:docx | ext:odt | ext:pdf | ext:rtf | ext:sxw | ext:psw | ext:ppt | ext:pptx | ext:pps | ext:csv | ext:txt | ext:html`