diff --git a/man2/statfs.2 b/man2/statfs.2
index 4856ef5eb..c22bf8a8c 100644
--- a/man2/statfs.2
+++ b/man2/statfs.2
@@ -263,6 +263,18 @@ The Linux
 was inspired by the 4.4BSD one
 (but they do not use the same structure).
 .SH NOTES
+The
+.I __fsword_t
+type used for various fields in the
+.I statfs
+structure definition is a glibc internal type,
+not intended for public use.
+This leaves the programmer in a bit of a conundrum when trying to copy
+or compare these fields to local variables in a program.
+Using
+.I "unsigned\ int"
+for such variables suffices on most systems.
+
 The original Linux
 .BR statfs ()
 and