diff --git a/doc/find.texi b/doc/find.texi
index 56d3e32..d83c836 100644
--- a/doc/find.texi
+++ b/doc/find.texi
@@ -1013,6 +1013,10 @@ consistent with the result you get for @samp{ls -l} or @samp{wc -c}.
 This handling of sparse files differs from the output of the @samp{%k}
 and @samp{%b} format specifiers for the @samp{-printf} predicate.
 
+Note that e.g. @samp{-size -1M} and @samp{-size -1024k} do not yield the
+same results. The former matches files fitting in less than one 1-MB-blocks
+i.e. files fitting in zero 1-MB-blocks. The only files fullfilling
+this condition are empty ones.
 @end deffn
 
 @deffn Test -empty
diff --git a/find/find.1 b/find/find.1
index 25953fc..3ebce09 100644
--- a/find/find.1
+++ b/find/find.1
@@ -859,6 +859,11 @@ handle sparse files
 differently.  The `b' suffix always denotes 512-byte blocks and never
 1 Kilobyte blocks, which is different to the behaviour of 
 .BR \-ls .
+.IP
+Note that e.g. \fI\-size \-1M\fP and \fI\-size \-1024k\fP do not yield the
+same results. The former matches files fitting in less than one 1-MB-blocks
+i.e. files fitting in zero 1-MB-blocks. The only files fullfilling
+this condition are empty ones.
 
 .IP \-true
 Always true.
