diff --git a/htdocs/langs/en_US/main.lang b/htdocs/langs/en_US/main.lang
index b13e15b4a9f..dc2a83f2015 100644
--- a/htdocs/langs/en_US/main.lang
+++ b/htdocs/langs/en_US/main.lang
@@ -278,6 +278,7 @@ DateModificationShort=Modif. date
 IPModification=Modification IP
 DateLastModification=Latest modification date
 DateValidation=Validation date
+DateSigning=Signing date
 DateClosing=Closing date
 DateDue=Due date
 DateValue=Value date
diff --git a/htdocs/langs/en_US/other.lang b/htdocs/langs/en_US/other.lang
index 7a895bb1ca5..5ae6c7727b3 100644
--- a/htdocs/langs/en_US/other.lang
+++ b/htdocs/langs/en_US/other.lang
@@ -114,6 +114,7 @@ DemoCompanyAll=Company with multiple activities (all main modules)
 CreatedBy=Created by %s
 ModifiedBy=Modified by %s
 ValidatedBy=Validated by %s
+SignedBy=Signed by %s
 ClosedBy=Closed by %s
 CreatedById=User id who created
 ModifiedById=User id who made latest change