diff --git a/git_vuln_finder/vulnerability.py b/git_vuln_finder/vulnerability.py
index d1df6d0..326e1fe 100644
--- a/git_vuln_finder/vulnerability.py
+++ b/git_vuln_finder/vulnerability.py
@@ -16,6 +16,9 @@ from langdetect import detect as langdetect
 
 
 def find_vuln(commit, pattern, verbose=False):
+    """Find a potential vulnerability from a commit message thanks to a regex
+    pattern.
+    """
     m = pattern.search(commit.message)
     if m:
         if verbose: