1 files changed, 3 insertions, 1 deletions

diff --git a/lisp/international/ccl.el b/lisp/international/ccl.el
index e55f1fbcf36..93ad9358721 100644
--- a/lisp/international/ccl.el
+++ b/lisp/international/ccl.el
@@ -1305,7 +1305,9 @@ CCL-PROGRAM has this form:
 
 BUFFER_MAGNIFICATION is an integer value specifying the approximate
 output buffer magnification size compared with the bytes of input data
-text.  If the value is zero, the CCL program can't execute `read' and
+text.  It is assured that the actual output buffer has 256 bytes
+more than the size calculated by BUFFER_MAGNIFICATION.
+If the value is zero, the CCL program can't execute `read' and
 `write' commands.
 
 CCL_MAIN_CODE and CCL_EOF_CODE are CCL program codes.  CCL_MAIN_CODE