diff --git a/generator/src/main/kotlin/com/kylemayes/generator/support/Command.kt b/generator/src/main/kotlin/com/kylemayes/generator/support/Command.kt
index 6be373c..990ccbd 100644
--- a/generator/src/main/kotlin/com/kylemayes/generator/support/Command.kt
+++ b/generator/src/main/kotlin/com/kylemayes/generator/support/Command.kt
@@ -62,7 +62,7 @@ private fun execute(command: String, args: Array<String>, input: String? = null)
         process.waitFor(1, TimeUnit.SECONDS)
         process.destroyForcibly()
         val executed = "$command ${args.joinToString(" ")}".trim()
-        val message = "Failed to execute command ('$executed')."
+        val message = "Failed to execute command ('$executed'):\n${outputValue}"
         throw RuntimeException(message, errorValue ?: RuntimeException("Timed out."))
     }