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-rw-r--r--doc/extension.rdoc2
1 files changed, 1 insertions, 1 deletions
diff --git a/doc/extension.rdoc b/doc/extension.rdoc
index 40c68e8be0..f60e97f779 100644
--- a/doc/extension.rdoc
+++ b/doc/extension.rdoc
@@ -1767,7 +1767,7 @@ barriers. Please carefully consider the risks.
Before inserting write barriers, you need to know about RGenGC algorithm
(gc.c will help you). Macros and functions to insert write barriers are
-available in in include/ruby/ruby.h. An example is available in iseq.c.
+available in include/ruby/ruby.h. An example is available in iseq.c.
For a complete guide for RGenGC and write barriers, please refer to
<https://bugs.ruby-lang.org/projects/ruby-trunk/wiki/RGenGC>.