diff --git a/src/Update/Program.cs b/src/Update/Program.cs
index 7bfc2b00f..e10f88d31 100644
--- a/src/Update/Program.cs
+++ b/src/Update/Program.cs
@@ -608,8 +608,8 @@ static async Task signPEFile(string exePath, string signingOpts)
                     (?=\s+)             #positive look ahead for white space(s) 
                 "
                 ).Replace(signingOpts, "/p ********");
-                var msg = String.Format("Failed to sign, command invoked was: '{0} sign {1} {2}'",
-                    exe, optsWithPasswordHidden, exePath);
+                var msg = String.Format("Failed to sign, command invoked was: '{0} sign {1} {2}' \n\nOutput from signtool.exe was:\n{3}",
+                    exe, optsWithPasswordHidden, exePath, processResult.Item2);
 
                 throw new Exception(msg);
             } else {