diff --git a/man2/reboot.2 b/man2/reboot.2
index 6ad5c6730..cd6b6ea90 100644
--- a/man2/reboot.2
+++ b/man2/reboot.2
@@ -40,7 +40,8 @@ reboot \- reboot or enable/disable Ctrl-Alt-Del
 .sp
 .BI "int reboot(int " magic ", int " magic2 ", int " cmd ", void *" arg );
 .sp
-/* Under glibc some of the constants involved have gotten
+/* Under glibc and most alternative libc's (including uclibc, dietlibc,
+   musl and a few others), some of the constants involved have gotten
    symbolic names RB_*, and the library call is a 1-argument
    wrapper around the 3-argument system call: */
 .sp