diff --git a/defender-endpoint/configure-contextual-file-folder-exclusions-microsoft-defender-antivirus.md b/defender-endpoint/configure-contextual-file-folder-exclusions-microsoft-defender-antivirus.md
index 2ec0756f45..28ca1d3163 100644
--- a/defender-endpoint/configure-contextual-file-folder-exclusions-microsoft-defender-antivirus.md
+++ b/defender-endpoint/configure-contextual-file-folder-exclusions-microsoft-defender-antivirus.md
@@ -98,6 +98,8 @@ If you don't specify any other options, the file/folder is excluded from all typ
 
 > [!NOTE]  
 > Wildcards are supported in file/folder exclusions.
+>
+> A backslash (\) is required before the colon (:) and after a file extension.
 
 #### Folders