diff --git a/README.md b/README.md
index 4b26c8b..efc80be 100644
--- a/README.md
+++ b/README.md
@@ -12,7 +12,7 @@ The Gene Normalizer provides tools for resolving ambiguous human gene references
 
 **[Live service](https://normalize.cancervariants.org/gene)**
 
-**[Documentation](https://gene-normalizer.readthedocs.io/latest/)** · [Installation](https://gene-normalizer.readthedocs.io/latest/install.html) · [Usage](https://gene-normalizer.readthedocs.io/latest/usage.html) · [API reference](https://gene-normalizer.readthedocs.io/latest/api/api.html)
+**[Documentation](https://gene-normalizer.readthedocs.io/latest/)** · [Installation](https://gene-normalizer.readthedocs.io/latest/install.html) · [Usage](https://gene-normalizer.readthedocs.io/latest/usage.html) · [API reference](https://gene-normalizer.readthedocs.io/latest/api/index.html)
 
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