diff --git a/.gitattributes b/.gitattributes
index 44f49c762a7..99286cae9bb 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -74,6 +74,7 @@ icu4j/src/com/ibm/icu/dev/test/perf/data/collation/TestNames_SerbianSR.txt -text
 icu4j/src/com/ibm/icu/dev/test/perf/data/collation/TestNames_Simplified_Chinese.txt -text
 icu4j/src/com/ibm/icu/dev/test/perf/data/collation/TestNames_Thai.txt -text
 icu4j/src/com/ibm/icu/dev/test/rbbi/rbbitst.txt -text
+icu4j/src/com/ibm/icu/dev/tool/docs/icu4j28.api.gz -text
 icu4j/src/com/ibm/icu/impl/data/icudata.jar -text
 icu4j/src/com/ibm/icu/impl/data/th.brk -text
 icu4j/src/com/ibm/richtext/textapps/resources/unicode.arabic.red -text
diff --git a/icu4j/src/com/ibm/icu/dev/tool/docs/icu4j28.api.gz b/icu4j/src/com/ibm/icu/dev/tool/docs/icu4j28.api.gz
new file mode 100644
index 00000000000..d95f52c360e
--- /dev/null
+++ b/icu4j/src/com/ibm/icu/dev/tool/docs/icu4j28.api.gz
@@ -0,0 +1,3 @@
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+size 19566