diff --git a/.config/fish/functions/latex-color.fish b/.config/fish/functions/latex-color.fish
index c8aca07..c942822 100644
--- a/.config/fish/functions/latex-color.fish
+++ b/.config/fish/functions/latex-color.fish
@@ -19,10 +19,12 @@ function latex-color --description "Get the LaTeX color from HEX code"
     end
 
     # Expand 3 hex to 4 hex
-    # TODO
-
-    # Expand 3 hex to 8 hex
     if test (string length $hex) -eq 3
+        set hex $(string join "" $hex 0)
+    end
+
+    # Expand 4 hex to 8 hex
+    if test (string length $hex) -eq 4
         set hex "$(string replace -ar '(.)' '$1$1' $hex)00"
     end