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diff --git a/doc/string.n b/doc/string.n
index 72a69ff..9108e7c 100644
--- a/doc/string.n
+++ b/doc/string.n
@@ -19,6 +19,14 @@ string \- Manipulate strings
Performs one of several string operations, depending on \fIoption\fR.
The legal \fIoption\fRs (which may be abbreviated) are:
.TP
+\fBstring cat\fR ?\fIstring1\fR? ?\fIstring2...\fR?
+.
+Concatenate the given strings just like direct juxtaposition
+would. This primitive is occasionally handier than juxtaposition when
+mixed quoting is wanted, or when the aim is to return the result of a
+concatenation without resorting to \fB[return -level 0]\fR. If no arg
+is present, an empty string is returned.
+.TP
\fBstring compare\fR ?\fB\-nocase\fR? ?\fB\-length\fI length\fR? \fIstring1 string2\fR
.
Perform a character-by-character comparison of strings \fIstring1\fR