diff --git a/lib/math/Kconfig b/lib/math/Kconfig
index 15bd50d..f19bc97 100644
--- a/lib/math/Kconfig
+++ b/lib/math/Kconfig
@@ -6,7 +6,12 @@
 	  calculations are in fixed point. Module will be called cordic.
 
 config PRIME_NUMBERS
-	tristate
+	tristate "Simple prime number generator for testing"
+	help
+	  This option provides a simple prime number generator for test
+	  modules.
+
+	  If unsure, say N.
 
 config RATIONAL
 	bool