1 files changed, 1 insertions, 0 deletions
diff --git a/bignum.c b/bignum.c
index 1357de0e87..08b4337262 100644
--- a/bignum.c
+++ b/bignum.c
@@ -7037,6 +7037,7 @@ Init_Bignum(void)
     rb_define_method(rb_cBignum, "even?", rb_big_even_p, 0);
 
 #ifdef USE_GMP
+    /* The version of loaded GMP. */
     rb_define_const(rb_cBignum, "GMP_VERSION", rb_sprintf("GMP %s", gmp_version));
 #endif