3 files changed, 6 insertions, 3 deletions
diff --git a/lsp.c b/lsp.c
index a7d7e2f..dde58d6 100644
--- a/lsp.c
+++ b/lsp.c
@@ -523,6 +523,11 @@ LSP *lsp_create(const char *root_dir, const char *command, const char *configura
 	lsp->quit_sem = SDL_CreateSemaphore(0);	
 	lsp->error_mutex = SDL_CreateMutex();
 	lsp->messages_mutex = SDL_CreateMutex();
+	
+	// document ID 0 is reserved
+	LSPDocumentID zero_id = lsp_document_id(lsp, "");
+	assert(zero_id == 0);
+	
 	arr_add(lsp->workspace_folders, lsp_document_id(lsp, root_dir));
 	lsp->workspace_folders_mutex = SDL_CreateMutex();
 	
diff --git a/lsp.h b/lsp.h
index 68e90e6..1e11180 100644
--- a/lsp.h
+++ b/lsp.h
@@ -8,7 +8,7 @@
 #include "ds.h"
 #include "os.h"
 
-// an ID specific to a path. 0 is a valid document ID, currently.
+// an ID specific to a path. a document's ID is never 0 (thanks to lsp_create).
 typedef u32 LSPDocumentID;
 // ID of an LSP server. a server's ID is never 0.
 typedef u32 LSPID;
diff --git a/main.c b/main.c
index 32553da..8393da8 100644
--- a/main.c
+++ b/main.c
@@ -1,7 +1,5 @@
 /*
 @TODO:
-- don't let 0 be a valid LSPDocumentID
-- TESTING: check all IDE features with different servers
 - run everything through valgrind ideally with leak checking
 - some way of opening + closing all C files in directory for clangd
    textDocument/references to work?