Add a second parameter to the rcs_diff hook, and avoid bloating memory reading in enormous commits.

1 files changed, 5 insertions, 3 deletions

diff --git a/doc/plugins/write.mdwn b/doc/plugins/write.mdwn
index adc20af72..f0f79ebc7 100644
--- a/doc/plugins/write.mdwn
+++ b/doc/plugins/write.mdwn
@@ -1151,11 +1151,13 @@ The data structure returned for each change is:
 		],
 	}
 
-#### `rcs_diff($)`
+#### `rcs_diff($;$)`
+
+The first parameter is the rev from `rcs_recentchanges`.
+The optional second parameter is how many lines to return (default: all).
 
-The parameter is the rev from `rcs_recentchanges`.
 Should return a list of lines of the diff (including \n) in list
-context, and the whole diff in scalar context.
+context, and a string containing the whole diff in scalar context.
 
 #### `rcs_getctime($)`