diff --git a/doc/bash.1 b/doc/bash.1
index 6e8aebb..e846e68 100644
--- a/doc/bash.1
+++ b/doc/bash.1
@@ -10333,6 +10333,7 @@ and
 which are in 512-byte increments.
 The return status is 0 unless an invalid option or argument is supplied,
 or an error occurs while setting a new limit.
+In POSIX Mode 512-byte blocks are used for the `-c' and `-f' options.
 .RE
 .TP
 \fBumask\fP [\fB\-p\fP] [\fB\-S\fP] [\fImode\fP]
-- 
2.9.3

