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# DP: Clarify documentation about substring expansion
--- a/bash/doc/bash.1
+++ b/bash/doc/bash.1
@@ -2758,6 +2758,9 @@
below).
If \fIoffset\fP evaluates to a number less than zero, the value
is used as an offset from the end of the value of \fIparameter\fP.
+Arithmetic expressions starting with a - must be separated by whitespace
+from the preceding : to be
+distinguished from the \fBUse Default Values\fP expansion.
If \fIlength\fP evaluates to a number less than zero, and \fIparameter\fP
is not \fB@\fP and not an indexed or associative array, it is interpreted
as an offset from the end of the value of \fIparameter\fP rather than
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