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-rw-r--r--doc/filter_design.txt2
1 files changed, 1 insertions, 1 deletions
diff --git a/doc/filter_design.txt b/doc/filter_design.txt
index c303c3c9c3..fca24a94b5 100644
--- a/doc/filter_design.txt
+++ b/doc/filter_design.txt
@@ -166,7 +166,7 @@ Buffer references ownership and permissions
WRITE permission.
* Filters that read their input to produce a new frame on output (like
- scale) need the READ permission on input and and must request a buffer
+ scale) need the READ permission on input and must request a buffer
with the WRITE permission.
* Filters that intend to keep a reference after the filtering process