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-rw-r--r--doc/contributing/building_ruby.md1
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diff --git a/doc/contributing/building_ruby.md b/doc/contributing/building_ruby.md
index 489ddc1980..ffaa3a7dc9 100644
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+++ b/doc/contributing/building_ruby.md
@@ -21,6 +21,7 @@
* readline/editline (libedit)
* libffi
+ * gmp (if you with to accelerate Bignum operations)
* libexecinfo (FreeBSD)
* rustc - 1.58.0 or later (if you wish to build [YJIT](/doc/yjit/yjit.md))