diff --git a/variants-doc/variant-btcr.mermaid b/variants-doc/variant-btcr.mmd
similarity index 100%
rename from variants-doc/variant-btcr.mermaid
rename to variants-doc/variant-btcr.mmd
diff --git a/variants-doc/variant-original.mermaid b/variants-doc/variant-original.mmd
similarity index 100%
rename from variants-doc/variant-original.mermaid
rename to variants-doc/variant-original.mmd
diff --git a/variants-doc/variant-relaxed.mermaid b/variants-doc/variant-relaxed.mmd
similarity index 100%
rename from variants-doc/variant-relaxed.mermaid
rename to variants-doc/variant-relaxed.mmd