diff --git a/pkg/github/repositories.go b/pkg/github/repositories.go
index 6c7c65a5f..b1fe5bf72 100644
--- a/pkg/github/repositories.go
+++ b/pkg/github/repositories.go
@@ -560,7 +560,7 @@ func GetFileContents(getClient GetClientFn, getRawClient raw.GetRawClientFn, t t
 					), nil
 				}
 				if fileContent == nil || fileContent.SHA == nil {
-					return mcp.NewToolResultError("file content SHA is nil"), nil
+					return mcp.NewToolResultError("file content SHA is nil, if a directory was requested, path parameters should end with a trailing slash '/'"), nil
 				}
 				fileSHA = *fileContent.SHA