diff --git a/sys/kern/kern_environment.c b/sys/kern/kern_environment.c
index 6769c067a01f..a3342b4c8200 100644
--- a/sys/kern/kern_environment.c
+++ b/sys/kern/kern_environment.c
@@ -101,6 +101,9 @@ getenv_quad(const char *name, quad_t *data)
     return(1);
 }
 
+/*
+ * Export for userland.  See kenv(1) specifically.
+ */
 static int
 sysctl_kernenv(SYSCTL_HANDLER_ARGS)
 {