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diff --git a/docs/API-ABI-Changes b/docs/API-ABI-Changes
index c70c6f0..0216234 100644
--- a/docs/API-ABI-Changes
+++ b/docs/API-ABI-Changes
@@ -35,3 +35,24 @@ LibCSS 0.2.0 --> LibCSS 0.3.0
get_libcss_node_data
New selection handler function used to retrieve private cache belonging
to libcss from document element nodes.
+
+
+LibCSS 0.3.0 --> LibCSS 0.4.0
+-----------------------------
+
+ The API is changed.
+
+ Due to the change from CSS2 overflow to CSS3 overflow properties, the
+ computed style access functions for overflow properties have changed.
+ The overflow property is removed. Added are overflow-x and overflow-y
+ properties. (The overflow shorthand property now sets overflow-x and
+ overflow-y.)
+
+ This change affects the following functions:
+
+ Removed from include/libcss/computed.h -- css_computed_overflow()
+
+ Added to include/libcss/computed.h -- css_computed_overflow_x()
+
+ Added to include/libcss/computed.h -- css_computed_overflow_y()
+