--- a/KOST_Orbiter/kost_math.h
+++ b/KOST_Orbiter/kost_math.h
@@ -32,8 +32,8 @@
 extern "C" {
 #endif
 
-//double acosh(double x);
-//double asinh(double x);
+double acosh(double x);
+double asinh(double x);
 
 #ifdef __cplusplus
 }