diff --git a/buffer/buffer_putsa.3 b/buffer/buffer_putsa.3
index ed1c3c3..3251acb 100644
--- a/buffer/buffer_putsa.3
+++ b/buffer/buffer_putsa.3
@@ -6,7 +6,7 @@ buffer_putsa \- write stralloc to buffer
 .B #include <stralloc.h>
 .B #include <buffer.h>
 
-int \fBbuffer_putsa\fP(buffer* \fIb\fR,const char* \fIx\fR);
+int \fBbuffer_putsa\fP(buffer* \fIb\fR,stralloc* \fIx\fR);
 .SH DESCRIPTION
 buffer_putsa is equivalent to buffer_put(b,x.sa,x.len).
 .SH "RETURN VALUE"