diff --git a/src/resources/filters/customnodes/theorem.lua b/src/resources/filters/customnodes/theorem.lua
index e05eca41024..1aa8687a837 100644
--- a/src/resources/filters/customnodes/theorem.lua
+++ b/src/resources/filters/customnodes/theorem.lua
@@ -50,6 +50,16 @@ theorem_types = {
     style = "plain",
     title = "Algorithm"
   },
+  axm = {
+    env = "axiom",
+    style = "definition",
+    title = "Axiom"
+  },
+  asp = {
+    env = "assumption",
+    style = "definition",
+    title = "Assumption"
+  },
 }
 
 function has_theorem_ref(el)
diff --git a/src/resources/language/_language-es.yml b/src/resources/language/_language-es.yml
index 5ec78c8ac4d..83a2fc30673 100644
--- a/src/resources/language/_language-es.yml
+++ b/src/resources/language/_language-es.yml
@@ -93,6 +93,8 @@ crossref-cnj-title: "Conjetura"
 crossref-def-title: "Definición"
 crossref-exm-title: "Ejemplo"
 crossref-exr-title: "Ejercicio"
+crossref-axm-title: "Axioma"
+crossref-asp-title: "Suposición"
 crossref-ch-prefix: "Capítulo"
 crossref-apx-prefix: "Apéndice"
 crossref-sec-prefix: "Sección"
diff --git a/src/resources/language/_language.yml b/src/resources/language/_language.yml
index f2a7f22803f..13fc00cb77e 100644
--- a/src/resources/language/_language.yml
+++ b/src/resources/language/_language.yml
@@ -93,6 +93,8 @@ crossref-cnj-title: "Conjecture"
 crossref-def-title: "Definition"
 crossref-exm-title: "Example"
 crossref-exr-title: "Exercise"
+crossref-axm-title: "Axiom"
+crossref-asp-title: "Assumption"
 crossref-ch-prefix: "Chapter"
 crossref-apx-prefix: "Appendix"
 crossref-sec-prefix: "Section"