diff --git a/.vimrc b/.vimrc
index 6d1ed13..b5b023b 100644
--- a/.vimrc
+++ b/.vimrc
@@ -1213,6 +1213,7 @@ fu! Build(optimized=0, silent=0)
 
     let l:is_jai = 0
     let l:has_jai_build_file = 0
+    let l:has_jai_first_file = 1
 
     let l:ext = tolower(expand('%:e'))
     let l:current_dir  = expand('%:p:h')
@@ -1225,16 +1226,24 @@ fu! Build(optimized=0, silent=0)
 
         " Check for a build file in the current directory or one directory back
         " (e.g. we're in modules/ or src/, code/, etc)
-        if filereadable(l:current_dir . "/build.jai") || filereadable(l:one_dir_back . "/build.jai")
+        if filereadable(l:current_dir . "/build.jai") || filereadable(l:one_dir_back . "/build.jai") || filereadable(l:current_dir . "/first.jai") || filereadable(l:one_dir_back . "/first.jai")
             let l:has_jai_build_file = 1
 
             if filereadable(l:current_dir . "/build.jai") == 1
                 let l:cmd = "jai ". l:current_dir . "/build.jai"
+            elseif filereadable(l:current_dir . "/first.jai") == 1
+                let l:cmd = "jai ". l:current_dir . "/first.jai"
+                let l:has_jai_first_file = 1
             else
                 " It's one directory back. We don't want to include '../' in
                 " the cmd because then our reported paths in the program get
                 " botched, e.g. path shown in an assert error.
-                let l:cmd = "jai " . l:one_dir_back . "/build.jai"
+                if filereadable(l:one_dir_back . "/build.jai") == 1
+                    let l:cmd = "jai " . l:one_dir_back . "/build.jai"
+                else
+                    let l:cmd = "jai " . l:one_dir_back . "/first.jai"
+                    let l:has_jai_first_file = 1
+                endif
             endif
         else
             let l:cmd = "jai % "
@@ -1251,8 +1260,13 @@ fu! Build(optimized=0, silent=0)
         let l:set_metaprogram_args = 0
 
         if l:has_jai_build_file
+            let l:filename = "build.jai"
+            if l:has_jai_first_file
+                let l:filename = "first.jai"
+            endif
+
             if a:optimized == 1
-                echo "Compiling release build.jai"
+                echo "Compiling release " . l:filename
                 " @note We pass 'release' as a user metaprogram arg for the
                 " build file to parse in case it cares about that. -release is
                 " a compiler arg that we also include because some build
@@ -1262,7 +1276,7 @@ fu! Build(optimized=0, silent=0)
                 let l:cmd .= " -release - -release"
                 let l:set_metaprogram_args = 1
             else
-                echo "Compiling debug build.jai"
+                echo "Compiling debug " . l:filename
             endif
         else
             if a:optimized == 1