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-rw-r--r--doc/OpenFileChnl.32
1 files changed, 1 insertions, 1 deletions
diff --git a/doc/OpenFileChnl.3 b/doc/OpenFileChnl.3
index 582ff4b..82851da 100644
--- a/doc/OpenFileChnl.3
+++ b/doc/OpenFileChnl.3
@@ -277,7 +277,7 @@ If an error occurs while opening the channel, \fBTcl_OpenCommandChannel\fR
returns NULL and records a POSIX error code that can be retrieved with
\fBTcl_GetErrno\fR.
In addition, \fBTcl_OpenCommandChannel\fR leaves an error message in
-the interpreter's result if \fIinterp\fR is not NULL.
+the interpreter's result. \fIinterp\fR cannot be NULL.
.PP
The newly created channel is not registered in the supplied interpreter; to
register it, use \fBTcl_RegisterChannel\fR, described below.