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-rw-r--r--docs/custom_mutators.md1
1 files changed, 1 insertions, 0 deletions
diff --git a/docs/custom_mutators.md b/docs/custom_mutators.md
index 3e3ae01d..129d6676 100644
--- a/docs/custom_mutators.md
+++ b/docs/custom_mutators.md
@@ -123,6 +123,7 @@ def deinit(): # optional for Python
Note that this function is optional - but it makes sense to use it.
You would only skip this if `post_process` is used to fix checksums etc.
so if you are using it e.g. as a post processing library.
+ Note that a length > 0 *must* be returned!
- `describe` (optional):