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diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -5,7 +5,8 @@ For more details about `accel_asc`, please refer to [Jerome Kelleher's website](
 
 ## Requirements
 
-- `(scheme generator)` of R7RS-large or `(srfi 158)`
+- R7RS-small
+- `(scheme generator)` or SRFI-158
 
 ## Usage