diff --git a/man/XDrawImageString.man b/man/XDrawImageString.man
index e98076d1..fb741dee 100644
--- a/man/XDrawImageString.man
+++ b/man/XDrawImageString.man
@@ -149,6 +149,13 @@ window is used as a Drawable.
 .B BadMatch
 Some argument or pair of arguments has the correct type and range but fails
 to match in some other way required by the request.
+.SH NOTES
+Unlike XDrawString and XDrawString16,
+these functions send no more than 255 characters at a time to the server.
+When the total number of characters to be sent is larger than 255,
+these functions split the string into chunks up to 255 characters.
+After sending each chunk,
+these functions query the server to determine the actual text extent.
 .SH "SEE ALSO"
 XDrawString(__libmansuffix__),
 XDrawText(__libmansuffix__),